Question

A magnetic flux of $500\mu Wb$ passing through a $200$ turns coil is reversed in $20\times {10}^{-3}$ seconds. The average emf per unit area induced in the coil in $V/m^2$ is

• A. $2.5$
• B. $5.0$
• C. $7.5$
• D. $10.0$

Answer 1

Answer: (D)

$10.0$

$Emf=N\frac{△\varphi }{△t}$
$=\frac{2\times 500\times {10}^{-6}\times 200}{20\times {10}^{-3}}$
$=10V/m^2$