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A rectangular coil of 100 turns and size `0.1mxx0.05m` is placed perpendicular to a magnetic field of 0.1 T. If the field drops to 0.05 T in 0.05 s, the magnitude of the emf induced in the coil isA. `sqrt2`B. `sqrt3`C. `sqrt(0.6)`D. 0.5 |
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Answer» Correct Answer - D Given, n= 100 turns, A = `0.1xx0.05m^(2)` `B_(1)=0.1T, B_(2)=0.05T, dt=0.05s` We know that, `e=|(-dphi)/(dt)|=|(d)/(dt)("n B A cos"theta)|=|(nAdBcos theta)/(dt)|` Here, `theta=0` `therefore" "e=|(nAdB)/(dt)|=|(100xx0.1xx0.05xx(0.1-0.05))/(0.05)|` `rArr" e = 0.5 V` None of the option is correct. |
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