2. A circular conducting ring is placed in a uniform magnetic field from an elec
ID: 2040601 • Letter: 2
Question
2. A circular conducting ring is placed in a uniform magnetic field from an electromagnet that is directed up, out of the page. a) If the magnetic field is suddenly switched off, will there be a current induced in the ring, if only briefly? If so, predict and explain its direction (CW or CCW as seen from above). b) If, while the magnetic field is still intact, the ring is lifted 2.0 cm upward, in the direction of the field's arrows, will any current be induced? Explain your answer. If, while the magnetic field is still intact, the ring is knocked completely out of the field will there be an induced current in the ring? If so, which direction will it flow (CW or CCW)? Explain. c) B (up, out of page)Explanation / Answer
a) As magnetic field is switched off Flux associated with coil changes and hence current is induced in loop. Direction of current from Lenz law is counterclockwise.
b) As there is no change in Flux no current will be induced in loop.
c) Yes current will be induced in loop. Direction will be counterclockwise. Again reason is same as in (a)
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