Question

Some electronic devices such as phones and watches can be charged wirelessly. In the charger, there is a coil that generates a rapidly changing magnetic field. In the device, there is a second, 100-turn rectangular coil with side lengths of 3.0 cm and 4.0 cm.

If the maximum rate of the change of the magnetic field and the second coil is 53 T/s, what is the EMF induced in this coil?

Answer 1

Magnitude of induced emf will be equal to 6.36 volt

Step-by-step explanation:

We have given number of turns N = 100

Dimension of rectangle is 3 cm and cm

So area of rectangle
`A=0.03* 0.04=0.0012m^2`

Rate of change of magnetic field
`(dB)/(dt)=53T/sec`

Induced emf is equal to
`e=-N(d\Phi )/(dt)`

`e=-NA(dB )/(dt)`

`e=-100* 0.0012* 53=-6.36volt`

So magnitude of induced emf will be equal to 6.36 volt