First slide

Magnetic Flux

Question

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 180^o, then the new instantaneous maximum deflection will be

Easy

A

7 unit
B

14 unit
C

0 unit
D

21 unit

Solution

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

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