Question

Magnetic field charge at the rate of $0.4T/sec$. in a square coil of side $4cm$. kept perpendicular to the field. If the resistance of the coil is:

• A. $0.16A$
• B. $0.32A$
• C. $3.2A$
• D. $1.6A$

Answer 1

The correct option is B $0.32A$

Given,

Resistance, $R=2\times {10}^{-3}\Omega$

Area, $A=a^2={0.04}^2$

Using the relation

$IR=A\frac{dB}{dt}$

$I=0.32A$