Question

Some magnetic flux is changed from a coil of resistance $10\Omega$. As a result, an induced current is developed in it, which varies with time as shown in the figure. The magnitude of change in flux through the coil in webers is:

• A. $2$
• B. $4$
• C. $6$
• D. $8$

Answer 1

Answer: (A)

$2$

Some magnetic flux is changed from a coil of resistance 10Ω. As a result, an induced current is developed in it, which varies with time as shown in the figure. The magnitude of change in flux through the coil in webers is:

$dq=\frac{d\varphi }{dt}$

$d\varphi =dq\ast dt=$area of i-t graph *R

$d\varphi =\frac{1\ast 10\ast 0.1\ast 4}{2}=2weber.$