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Q.

A rectangular coil made of copper wires is rotated in a magnetic field. The direction of the current induced changes once in every


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a

two revolutions

b

one revolution

c

half revolution

d

one-fourth revolution 

answer is C.

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Detailed Solution

A rectangular coil made of copper wires is rotated in a magnetic field. The direction of the current induced changes once in every half revolution.
The current induced in the rectangular coil by the magnetic field causes the coil to turn due to the force caused by the magnetic field. The direction of the induced current changes at every turn or at every half-revolution. Thus, the direction of the induced current changes once in each half-revolution.
 
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A rectangular coil made of copper wires is rotated in a magnetic field. The direction of the current induced changes once in every