Q.

In rural areas where electric power lines carry current to big cities, it is possible to generate small amount of electricity from the lines by means of induction in a single coil. The overhead power lines carry relatively large currents that periodically reverse in direction 50 times per second. How would you orient the plane of the coil to produce maximum induced current if the power lines ran in a north-to-south direction? 

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a

The orientation of the coil would not affect the value of the induced current

b

Perpendicular to the ground in the East-West direction

c

Parallel to the ground

d

Perpendicular to the ground in the North-South direction

answer is B.

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Detailed Solution

If the plane of coil is vertical in N – S direction, then magnetic field produced by current in the power line is perpendicular to the plane of coil, producing maximum magnetic flux, which varies due to variation in current of power line.

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