Answer the following.
If the magnetic field is parallel to the positive Y-axis and the charged particle is moving along the positive X-axis, which way would the Lorentz force be for: (i) an electron, (ii) a proton.
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Moving charges and magnetism - ISC Class 12 Physics Questions with Answers, Page 2
99 past-paper questions on Moving charges and magnetism from ISC Class 12 Physics papers (2027-2018), newest first, in full. Questions 21-40 are on this page, 20 to a page. Tap "Show answer" under a question to see its answer.
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Solve the following.
What must be the resistance connected to convert the galvanometer into an ammeter of the range 0-200 mA?
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Solve the following.
An electron and a proton are moving along the $+X$ axis. If an external magnetic field $B = 0.314\text{ T}$ is applied along $-Z$ axis:
(a)[1.5]
What is the path followed by the electron due to the magnetic field?
(b)[1.5]
Calculate the frequency of revolution of the proton.
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Answer the following.
Two long wires carrying current are kept crossed (not touching each other) as shown in figure. If resultant magnetic induction at P is zero, then find the relation between $I_1$ and $I_2$.
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Solve the following.
A long straight wire in the horizontal plane carries a current of 50 A in the north-to-south direction. Give the magnitude and direction of ‘B’ at a point 2.5 m east of the wire.
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Answer the following.
Use this expression to define an ampere.
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Answer the following.
A finite-length Movable wire (XY) carrying current $i_1$ is kept parallel to another infinite-length Fixed wire (PQ) carrying current $i_2$ above it. In this setup, the Movable wire (XY) is stationary as depicted below.
Redraw a new setup such that the Movable wire (XY) remains stationary and is placed parallel below the Fixed wire (PQ) carrying current $i_2$. Label the direction of current $i_1$ in the Movable wire (XY).
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Solve the following.
transverse to its initial velocity.
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Choose the correct option.
Ampere's circuital law states that:
- (a)the line integral of a magnetic field along the boundary of the closed loop is equal to $\mu_0$ times the total current passing near the surface.
- (b)the line integral of a magnetic field along the boundary of the closed loop is equal to $\mu_0$ times the total current passing through the surface.
- (c)the surface integral of the magnetic field over the closed loop is equal to $\mu_0$ times the total current passing through the surface.
- (d)the surface integral of the magnetic field over the closed loop is equal to $\mu_0$ times the total current passing near the surface.
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Answer the following.
What is the nature of force experienced by arms PQ and RS?
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Choose the correct option.
The magnetic induction at any point due to a long straight wire carrying a current is:
- (a)inversely proportional to the distance from the wire.
- (b)inversely proportional to the square of the distance from the wire.
- (c)does not depend on distance.
- (d)proportional to the distance from the wire.
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Choose the correct option.
Magnetic field inside a long current carrying solenoid is $B_0$. If each of the current ($I$) and the number of turns ($N$) in this solenoid are doubled, magnetic field $B_1$ inside it becomes:
- (a)$B_1 = B_0 / 4$
- (b)$B_1 = B_0 / 2$
- (c)$B_1 = B_0$
- (d)$B_1 = 4B_0$
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Choose the correct option.
A charged particle is moving with velocity $\vec{v}$ in a magnetic field of induction $\vec{B}$. The force on the particle will be maximum when:
- (a)$\vec{v}$ and $\vec{B}$ are at an angle of $45^\circ$.
- (b)$\vec{v}$ and $\vec{B}$ are perpendicular.
- (c)$\vec{v}$ and $\vec{B}$ are in the same direction i.e., at an angle of $0^\circ$.
- (d)$\vec{v}$ and $\vec{B}$ are in opposite directions i.e., at an angle of $180^\circ$.
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Solve the following.
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 moves at $3 \times 10^6\text{ m/s}$ along the +Y-axis.
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Choose the correct option.
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 coil is opened and rewound such that the radius of the newly formed coil is 2R, carrying the same current I, what will be the magnetic field at the centre O?
- (a)2B
- (b)B
- (c)B/2
- (d)B/4
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Answer the following.
A student records the following data for the magnitudes ($B$) of the magnetic field at axial points at different distances $x$ (See Figure 7 given below) from the centre O of a circular coil of radius $a$ carrying a current $I$. Verify (for any two) that these observations are in good agreement with the expected theoretical values of $B$.
| $x$ | $x = 0$ | $x = a$ | $x = 2a$ | $x = 3a$ |
|---|---|---|---|---|
| $B$ | $B_0$ | $\frac{B_0}{2\sqrt{2}}$ | $\frac{B_0}{5\sqrt{5}}$ | $\frac{B_0}{10\sqrt{10}}$ |
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Choose the correct option.
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 they are attracting each other. What change should the student make for the wires to repel each other?
- (a)Reverse the terminals of batteries $E_1$ and $E_2$.
- (b)Reverse the terminals of battery $E_1$ or $E_2$.
- (c)Choose supply voltage such that $E_1 = E_2$.
- (d)Add key and ammeter to the circuit.
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Answer the following.
An electron moving along positive X axis with a velocity of $8 \times 10^7\text{ ms}^{-1}$ enters a region having uniform magnetic field $B = 1\cdot 3 \times 10^{-3}\text{ T}$ along positive Y axis.
(a)[1.5]
Explain why the electron describes a circular path.
(b)[1.5]
Calculate the radius of the circular path described by the electron.
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Solve the following.
Determine resistance of the ammeter.
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Answer the following.
You are provided with one low resistance $R_L$ and one high resistance $R_H$ and two galvanometers, $G_1$ and $G_2$. Draw diagrams to show how you will convert $G_1$ to a voltmeter and $G_2$ to an ammeter.
Draw: circuit diagrams showing conversion of $G_1$ to a voltmeter and $G_2$ to an ammeter
Must show: galvanometer $G_1$ in series with high resistance $R_H$, galvanometer $G_2$ in parallel with low resistance $R_L$ (shunt)
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