Question

In a coil of resistance $10\Omega$, the induced current developed by changing magnetic flux through it, is shown in figure as a function of time. The magnitude of change in flux through the coil in Weber is-

• A. $2$
• B. $6$
• C. $4$
• D. $8$

Answer 1

The correct option is A $2$

As there is a change in flux, there will be a current generated. Which is given by,

$I=\left|\frac{1}{R}\frac{d\varphi }{dt}\right|$

$\Rightarrow$ $\left|d\varphi \right|=\left|IRdt\right|$

$d\varphi =$ (Area of triangle)$\times R$

$=(\frac{1}{2}\times 4\times 0.1)\times 10=2Wb$