First slide

Faraday's law of Electromagnetic induction

Question

A physicist works in a laboratory where the magnetic field is 4 T. She wears a necklace enclosing area 0.01 $m^{2}$ in such a way that the plane of the necklace is normal to the field and is having a resistance R = 0.01 $Ω$ . Because of power failure, the field decays to 1 T in time $10^{- 3}$ seconds. Then what is the total heat produced in her necklace? (T = Tesla)

Moderate

A

10 J
B

20 J
C

90 J
D

40 J

Solution

$H = \frac{V^{2} t}{R} and V = \frac{N (B_{2} - B_{1}) Acosθ}{t}$
$V = \frac{1 \times (4 - 1) \times 0 .01 \times \cos 0^{o}}{10^{- 3}} = 30 V$
$So, H = \frac{{(30)}^{2} \times 10^{- 3}}{0 .01} = 90 J$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App