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

Induced emf through a loop of wire is 3.5 V.

Step-by-step 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=-(\phi_f-\phi_i)/(t)`

`\epsilon=-(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.