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A solenoid has 2000 turns would over a length of 0.30 m. The area of its cross-section is `1.2xx10^(-2)m^(2)`. If an initial current of 2 A in the solenoid is reversed in 0.25 s, then the emf induced in the coil isA. `6xx10^(-4)V`B. `4.8xx10^(-3)V`C. `6xx10^(-2)V`D. `32.1xx10^(-2)V` |
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Answer» Correct Answer - D Induced emf, `e=(Li)/(dt)=(mu_(0)N^(2)S)/(l)(di)/(dt)` `=(4pixx10^(-7)xx(2000)^(2)xx1.2xx10^(-3))/(0.30)xx((4)/(0.25))=32.1xx10^(-2)V` |
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