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A coil of effective area 2m^2 is placed at right angles to a uniform magnetic field of induction B. When the field reduces to ten percent of its original value in 0.6sec, an e.m.f. of 0.24 V induced in it. What is the magnitude of magnetic induction (B)? |
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Answer» SOLUTION :DB = (1-0.1) B = 0.9B e = `dphi/dt` = d(BA)/dt = A(dB)/dt` `THEREFORE dB = (edt)/A ` `therefore 0.9B = (0.24xx0.6)/2 = 0.072` `therefore B =0.08Wb//m^2` |
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