Question 349: Electromagnetic Induction

Question

A coil of resistance 400 $$\Omega $$ is placed in a magnetic field. If the magnetic flux $$\phi $$ (Wb) linked with the coil varies with time t (sec) as $$\phi  = 50{t^2} + 4$$.
The current in the coil at t = 2 sec is

Accepted Answer

According, to FaradayÃ¢ÂÂs law of induction
Induced e.m.f, $$\varepsilon  =  - {{d\phi } \over {dt}}$$ = -(100t)
Induced current i at t = 2 sec.
= $$\left| {{\varepsilon  \over R}} ight| =  + {{100 	imes 2} \over {400}}$$ = +0.5 A

Answer

0.5 A

Answer

0.1 A

Answer

2 A

Answer

1 A

Electromagnetic Induction

A coil of resistance 400 $\Omega is placed in a magnetic field. If the magnetic flux \phi (Wb) linked with the coil varies with time t (sec) as \phi = 50{t^2} + 4$. The current in the coil at t = 2 sec is

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