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CBSE Class 12-science Answered

A coil of cross-sectional area 10² cm² is placed in the magnetic field, which changes to 8×10-2 wb/cm² with in 5 seconds. What will be the current across 5 Ω resistances?
Asked by Topperlearning User | 06 Jul, 2015, 02:45: PM
answered-by-expert Expert Answer

begin mathsize 12px style We space know space that comma space
straight ϕ equals stack straight B times with rightwards arrow on top straight A with rightwards arrow on top
or comma space dϕ equals AdB space left parenthesis because space only space magnetic space field space is space changing right parenthesis
straight epsilon equals negative dϕ over dt equals negative AbB over dt equals fraction numerator 10 squared cross times 8 cross times 10 to the power of negative 2 end exponent over denominator 5 end fraction equals negative 8 over 5 space straight V
straight i equals straight epsilon over straight R equals fraction numerator 8 over denominator 5 cross times 5 end fraction equals 8 over 25 equals 0.32 space straight A
end style

Answered by | 06 Jul, 2015, 04:45: PM
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