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Q.

A galvanometer is connected to the secondary coil. The galvanometer shows an instantaneous maximum deflection of 7 divisions when current is started in the primary coil of the solenoid. Now if the primary coil is rotated though 180o, then the new instantaneous maximum deflection will be

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a

7 unit

b

14 unit

c

0 unit

d

21 unit

answer is B.

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Detailed Solution

When the coil is rotated through 180o, the flux changes from Φ and −Φ. Hence change in flux isΦ−(−Φ)=2Φ Further Φ=Mi∴ Change in current = 2 iThis causes a deflection of 14 units.

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