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Q.

current of SA. A coil of radius· 1 cm having 100 turns and a total resistance of 20Ω is placed inside the solenoid co-axially. The coil is connected to galvanometer. If current in the solenoid is reversed in direction. Find the charge flown through the galvanometer.

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a

2 x 10-4 C

b

1 x 10-4 C

c

4 x 10-4 C

d

8 x 10-4 C

answer is A.

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Detailed Solution

B=μ0ni=4π x 10-7 x 104 x 5=2π x 10-2r ϕ=BNA=2π x 10-2 x 100 x π104=2π2 x 10-4 Charge=ϕi-ϕ2R=4π2 x 10-420=2 x 10-4 C

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