Question

he magnetic flux through a loop of wire decreases from 1.7 Wb to 0.3 Wb in a time of 0.4 s. What was the average value of the induced emf, in units of volts?

Answer 1

Answer:

Induced emf through a loop of wire is 3.5 V.

Explanation:

It is given that,

Initial magnetic flux, $\phi_i=1.7\ Wb$

Final magnetic flux, $\phi_f=0.3\ Wb$

The magnetic flux through a loop of wire decreases in a time of 0.4 s, t = 0.4 s

We need to find the average value of the induced emf. It is equivalent to the rate of change of magnetic flux i.e.

$\epsilon=-\dfrac{\phi_f-\phi_i}{t}$

$\epsilon=-\dfrac{0.3\ Wb-1.7\ Wb}{0.4\ s}$

$\epsilon=3.5\ V$

So, the value of the induced emf through a loop of wire is 3.5 V.