Question

A coil has an area of $0.05m^2$ and it has $800$ turns. It is placed perpendicular in a magnetic field of strength $4\times {10}^{-5}Wb/m^2$, it is rotated through ${90}^o$ in $0.1sec$. The average emf induced in the coil is

• A. $0.056V$
• B. $0.046V$
• C. $0.026V$
• D. $0.016V$

Answer 1

The correct option is D $0.016V$

${\varphi }_1=NBA$

${\varphi }_2=O$

$E_{a}vg=\frac{NBA}{Ot}$

$=\frac{800\times 4\times {10}^{-5}\times 0.05}{0.1}$

$=0.016V$

Hence (D) is correct answer