Answer the following questions: State any one difference between the nature of magnetic field…
Answer the following questions:
(i)
State any one difference between the nature of magnetic field inside a current carrying solenoid and that inside a toroid.
(ii)
A current is passed through a circular coil A in a clockwise direction, as shown in Figure 7. B is another circular coil which does not carry any current. However, when it is moved towards the coil A, current is induced in it. What is the direction of this induced current?
(iii)
Name the law on which your answer is based.
Answer
Answer (i)
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The magnetic field inside a long current-carrying solenoid is uniform throughout its interior, whereas inside a toroid the magnetic field is non-uniform across its cross-section (it varies inversely with the radial distance from the central axis).
Answer (ii)
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In the anticlockwise direction as viewed by observer O (to oppose the approaching clockwise current of coil A by developing a like polarity, North pole, according to Lenz's law).
Answer (iii)
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Lenz’s law (or Faraday-Lenz law of electromagnetic induction).
From ISC 2027 Specimen Physics Paper 1, question 12.