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NEET 2012 (AIPMT, Mains) · Magnetic Flux & Faraday's Law

Magnetic Flux & Faraday's Law question from NEET 2012 (AIPMT, Mains)

Q80NEET 2012 · AIPMT · MAINSMedium

Magnetic Flux & Faraday's Law

In a coil of resistance 10 $\Omega$ , 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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Answer: (b)

Charge $q$ = area under the $i$ – $t$ graph $= \frac{1}{2} \times 4 \times 0.1 = 0.2$ C.
$q = \frac{\Delta\phi}{R} \Rightarrow \Delta\phi = qR = 0.2 \times 10$
$\Delta\phi = 2$ Wb
So the answer is (b) 2.

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