Question

a straight line metal wire crosses a magnetic field of flux 4m wb in a time 0.4 S find the magnitude of the emf induced in the wire.

Answer 1

$\bold \purple{given} \: \: \\ flux = 4wb \\ \\ time = 0.4sec \\ \\ \: \: \: \: \: \bold \red{to \: find} \\ \\ emf \: induced = \\ \\ \\\green{we \: know \: \: emf = \frac{change \: in \: flux}{change \: in \: time}} \\ \\ \\ therefore \\ \\ emf = \frac{4}{0.4} = 10 \\ \\ hence \: ans = \boxed{10 \: v} \\ \\ \bold \purple{ till \: then \: be \: happy}$