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Q.

Some magnetic flux is changed from a coil of resistance 10 ohm. As a result, an induced current is developed in it, which varies with time as shown in figure. The magnitude of change in flux through the coil in webers is

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a

2

b

4

c

6

d

8

answer is A.

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Detailed Solution

Area under i – t graph gives the total charge flow

$here dq = \frac{1}{2} (0.1) (4) = 0.2 C$

$flux = R dq = 10 (0.2) = 2 weber$

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Some magnetic flux is changed from a coil of resistance 10 ohm. As a result, an induced current is developed in it, which varies with time as shown in figure. The magnitude of change in flux through the coil in webers is