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Q.

By using which method current in a coil can be induced?


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a

moving the coil in a magnetic field

b

changing the magnetic field around it

c

changing the orientation of the coil in the magnetic field

d

All of the above 

answer is D.

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Detailed Solution

We can induce the current in a coil by all the ways mentioned.
If the coil moves rapidly across the two poles of a magnet, then a current is induced in the coil. If the magnet is moved towards the coil, then current is induced in the coil. Finally, the orientation of the coil can be changed and thus induces a current in the coil. Hence, all the above methods are used to induce the potential difference across the ends of a coil and hence can induce a current.
 
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By using which method current in a coil can be induced?