Magnetic flux changes through a coil of resistance 10Ω. As a result, an induced current is developed in it, which varies with time as shown. The magnitude of change in magnetic flux through the coil is
[0.77 Mark]
A
2.5Wb
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B
3.5Wb
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C
1.5Wb
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D
6.1Wb
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Solution
The correct option is A2.5Wb As we know that E=−dϕdt
i=ER=−1Rdϕdt
⇒|dϕ|=idtR
⇒|ϕ|=R∫idt
The value of ∫idt is given by the area under the i - t graph.