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Moving charges and magnetism - ISC Class 12 Physics Questions with Answers

82 past-paper questions on Moving charges and magnetism from ISC Class 12 Physics papers (2027-2018), newest first. Open one to see its answer.

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An alpha particle is moving with a velocity v. It enters a uniform magnetic field (B) as shown in Figure 6 below. The magnetic… 2027 · 3 marks · Short answer
In Figure 2 below, CD is an infinitely long and straight metallic wire carrying a current I. Point P is at a perpendicular… 2027 · 1 mark · MCQ
A collimated beam of protons is travelling with a constant velocity along X-axis. There is a current carrying solenoid whose axis… 2026 · 1 mark · MCQ
(i) Write an expression of Biot-Savart law in vector form. (ii) State Ampere's circuital law. Write an expression of Biot-Savart… 2026 · 2 marks · Short answer
Using Ampere's circuital law, obtain an expression for magnetic flux density of the magnetic field at a point near a long… 2026 · 3 marks · Derivation
Three straight, parallel wires are coplanar and perpendicular to the plane of the page. The currents $I_1$ and $I_3$ are directed… 2026 · 1 mark · MCQ
Two moving coil galvanometers $G_1$ and $G_2$ are identical except that they have 50 turns and 20 turns and resistance of… 2026 · 2 marks · Numerical
Using Ampere circuital law, obtain an expression for magnetic field ‘B’ at a point at a perpendicular distance ‘r’ from a long… 2026 · 3 marks · Derivation
Answer the following questions: The north pole of a magnet is brought near a metallic ring R as shown in Figure 5 below. Mark the… 2026 · 3 marks · Short answer
An electron moving along positive X axis with a velocity of $8 \times 10^7\text{ ms}^{-1}$ enters a region having uniform… 2026 · 3 marks · Numerical
Three long parallel straight wires, X, Y and Z, are equally separated and placed in the same plane in a vacuum. They carry a… 2026 · 1 mark · MCQ
A student records the following data for the magnitudes (B) of the magnetic field at axial points at different distances x (See… 2026 · 3 marks · Short answer
Obtain an expression for magnetic field (B) at the centre of a circular coil having 'n' turns of radius 'R' when it is carrying a… 2026 · 3 marks · Derivation
Two moving coil galvanometers $G_{1}$ and $G_{2}$ are identical except for the following features: Two moving coil galvanometers… 2026 · 3 marks · Short answer
Answer the following questions: Mention any one factor on which current sensitivity of a moving coil galvanometer depends. Define… 2026 · 3 marks · Short answer
Figure 6 below shows a long straight conductor X carrying a current $I_{1}$. A point P is at a perpendicular distance '$r_{1}$'… 2026 · 3 marks · Short answer
A galvanometer of resistance $100\ \Omega$ gives a full-scale deflection for a potential difference of $200\text{ mV}$. What must… 2025 · 3 marks · Numerical
Two long wires carrying current are kept crossed (not touching each other) as shown in figure. If resultant magnetic induction at… 2025 · 2 marks · Short answer
A long straight wire in the horizontal plane carries a current of 50 A in the north-to-south direction. Give the magnitude and… 2025 · 2 marks · Numerical
In the figure, the straight wire AB is fixed while the loop PQRS is free to move. Give a reason for your response in each… 2025 · 3 marks · Long answer
In a moving coil galvanometer, why is the magnetic field made radial? You are provided with one low resistance $R_L$ and one high… 2025 · 3 marks · Drawing
A finite-length Movable wire (XY) carrying current $i_1$ is kept parallel to another infinite-length Fixed wire (PQ) carrying… 2025 · 1 mark · Short answer
Ampere's circuital law states that: 2025 · 1 mark · MCQ
The magnetic induction at any point due to a long straight wire carrying a current is: 2025 · 1 mark · MCQ
Magnetic field inside a long current carrying solenoid is $B_0$. If each of the current ($I$) and the number of turns ($N$) in… 2025 · 1 mark · MCQ
A charged particle is moving with velocity $\vec{v}$ in a magnetic field of induction $\vec{B}$. The force on the particle will… 2025 · 1 mark · MCQ
In the X - Y plane, a magnetic field of $4\text{ T}$ is applied along the Y-axis. Calculate the magnetic force on a proton, if it… 2025 · 1 mark · Numerical
A circular coil having N turns of radius R carrying a current I is used to produce a magnetic field B at its centre O. If this… 2025 · 1 mark · MCQ
A student records the following data for the magnitudes ($B$) of the magnetic field at axial points at different distances $x$… 2025 · 3 marks · Short answer
A student has made connections, as shown in Figure 2 below, so that the wires MN and ST repel each other. But it is observed that… 2025 · 1 mark · MCQ
An ideal Moving Coil Galvanometer (MCG) cannot be used as an ammeter to measure the value of current in a given circuit. The… 2025 · 1 mark · MCQ
A galvanometer of resistance $3\ \Omega$ can carry a maximum current of $25\text{ mA}$. Calculate the value of shunt resistance… 2025 · 1 mark · Numerical
An electron emitted by a heated cathode and accelerated through a potential difference of 2 kV, enters a region with a uniform… 2025 · 3 marks · Long answer
A galvanometer having a resistance of $20\ \Omega$ shows a full scale deflection with a current of $1\text{ mA}$. How can it be… 2025 · 3 marks · Numerical
A toroid is a hollow non-conducting circular ring, on which a large number of turns of a conducting wire are closely wound. If a… 2025 · 3 marks · Fill in
A synchrotron uses a combination of solenoid and toroid to generate high magnetic fields. Charged particles like electrons and… 2025 · 3 marks · Long answer
How much force per unit length acts on a long current carrying conductor X due to a current flowing through another similar… 2025 · 2 marks · Short answer
A circular coil of 20 turns and a radius of 10 cm is placed in a uniform magnetic field of 0.10 T normal to the plane of the… 2025 · 3 marks · Long answer
An electron moving along positive X axis with a velocity of $8 \times 10^7\text{ ms}^{-1}$ enters a region having uniform… 2025 · 3 marks · Numerical
A charge $10\ \mu\text{C}$ enters a region of the uniform magnetic field with a velocity $(4\hat{i} + 5\hat{j})\text{ m/s}$ and… 2025 · 1 mark · Numerical
Using Ampere’s circuital law, obtain an expression for magnetic field ‘B’ at a point ‘P’ which is at a perpendicular distance… 2025 · 3 marks · Derivation
Figure 5 below are two long, parallel wires carrying current in the same direction such that $I_1 < I_2$. In which direction will… 2025 · 2 marks · Short answer
An electron and a proton are moving along the $+X$ axis. If an external magnetic field $B = 0.314\text{ T}$ is applied along $-Z$… 2025 · 3 marks · Numerical
Two infinitely long straight wires PQ and RS carrying currents $I_1$ and $I_2$ respectively are kept $10\text{ cm}$ apart in… 2025 · 3 marks · Numerical
Lorenz's force is: 2025 · 1 mark · MCQ
The diagram depicts $\vec{v}$, $\vec{E}$ and $\vec{B}$ are mutually perpendicular. If direction of $\vec{E}$ is indicated with… 2025 · 5 marks · Long answer
Write an expression for Lorentz force in vector form. 2025 · 1 mark · Short answer
Magnetic field at the centre of a circular coil is $B$. Calculate the magnetic field at the same point when each of the current… 2025 · 2 marks · Numerical
Figure 4 below shows an infinitely long metallic wire YY’ which is carrying a current $I'$. P is a point at a perpendicular… 2024 · 3 marks · Short answer
When an electric current is passed through a moving coil galvanometer, its coil gets deflected. 2024 · 1 mark · Assertion-reason
Lorentz force in vector form is: 2024 · 1 mark · MCQ
Using Biot-Savart law, show that magnetic flux density ‘B’ at the centre of a current carrying circular coil of radius R is given… 2024 · 3 marks · Derivation
Two long straight wires A and B are kept parallel to each other, $5\text{ cm}$ apart, in vacuum. They carry currents of… 2023 · 2 marks · Numerical
Obtain an expression for magnetic flux density $B$ at the centre of a current carrying circular coil. 2023 · 3 marks · Derivation
Using Ampere’s circuital law, obtain an expression for magnetic flux density ‘$B$’ at a point near an infinitely long and… 2023 · 3 marks · Derivation
A circular coil has radius '$r$', number of turns '$N$' and carries a current '$I$'. Magnetic flux density '$B$' at its centre is: 2023 · 1 mark · MCQ
Magnetic flux density ($B$) of the magnetic field at a point on the axis of a long straight solenoid is given by: 2023 · 1 mark · MCQ
An electron moving with a velocity of $8 \times 10^6\text{ m/s}$ enters a uniform and transverse magnetic field of… 2023 · 2 marks · Numerical
A long straight wire AB carries a current of $5\text{ A}$. P is a proton travelling with a velocity of… 2023 · 2 marks · Numerical
A moving coil galvanometer of resistance $55\,\Omega$ produces a full scale deflection for a current of $250\text{ mA}$. How will… 2023 · 2 marks · Numerical
Which of the following is the right expression to define the magnetic field B? 2022 · 1 mark · MCQ
What is the angle between the current element $d\vec{l}$ and the magnetic flux density $\vec{B}$ at point P’ in the figure 11… 2022 · 1 mark · MCQ
A straight long wire is turned into a loop of radius $R = 10\text{ cm}$, as shown in figure 6 below. If a current… 2022 · 1 mark · MCQ
Figure 17 shows a right-angled isosceles triangle PQR having its base equal to ‘a’. A current of 1.0 A is passing downwards along… 2022 · 3 marks · Short answer
The resistance of a galvanometer is $50\ \Omega$. It is converted into a voltmeter or an ammeter. Calculate the resistance of the… 2022 · 2 marks · Short answer
What is the locus of an electron, projected perpendicular to a uniform magnetic field? 2022 · 1 mark · MCQ
How can a moving coil galvanometer be converted into a voltmeter? 2020 · 1 mark · Short answer
Write an expression for force per unit length between two long current carrying wires, kept parallel to each other, in vacuum and… 2020 · 2 marks · Short answer
Write Biot-Savart’s law in vector form. 2020 · 1 mark · Short answer
An electric current $I$ flows through an infinitely long conductor as shown in Figure 2(a) below. Write an expression and… 2019 · 2 marks · Short answer
An electric current $I$ flows through a circular loop as shown in Figure 2(b) below. Write an expression and direction for the… 2019 · 2 marks · Short answer
A rectangular loop of area $5\text{ m}^2$, has $50$ turns and carries a current of $1\text{ A}$. It is held in a uniform magnetic… 2019 · 2 marks · Numerical
Why are the pole pieces of a horseshoe magnet in a moving coil galvanometer made cylindrical in shape? 2019 · 1 mark · Short answer
How will you convert a moving coil galvanometer into a voltmeter? 2018 · 1 mark · Short answer
A long straight wire is bent as shown in Figure 2 below. Find the resultant magnetic field ‘$B$’ at the centre C of the circular… 2018 · 2 marks · Numerical
When would a moving charged particle travel undeviated in a uniform magnetic field? 2018 · 1 mark · Short answer
Current flowing through a long solenoid is varied. Then, magnetic flux density of the magnetic field inside it varies: 2018 · 1 mark · MCQ
A circular coil carrying a current $I$ has radius $R$ and number of turns $N$. If all the three, i.e. the current $I$, radius $R$… 2018 · 1 mark · MCQ
Calculate force per unit length acting on the wire B due to the current flowing in the wire A. (See Figure 2 below) 2018 · 2 marks · Numerical
Which of the two; an ammeter or a voltmeter, has a greater resistance? 2018 · 1 mark · Short answer
A long horizontal wire P carries a current of 50A. It is rigidly fixed. Another wire Q is placed directly above and parallel to… 2018 · 2 marks · Numerical
A moving charged particle $q$ travelling along the positive x-axis enters a uniform magnetic field $B$. When will the force… 2018 · 1 mark · Short answer

Moving charges and magnetism - ISC Class 12 Physics Questions with Answers

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