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Q.

In a coil of resistance of $10 Ω,$ the induced current developed by changing magnetic flux through it, is shown in figure as a function of time. The magnitude of change in flux through the coil in weber is

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a

8

b

2

c

6

d

4

answer is B.

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Detailed Solution

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$q = Area under i - t graph = \frac{1}{2} \times 4 \times 0.1 = 0.2 C$

$As q = \frac{Δ ϕ}{R} ∴ Δ ϕ = qR = (0.2 C) (10 Ω) = 2 weber$

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