If a coil of 40 turns and area 4.0 ${cm}^{2}$ is suddenly removed from a magnetic field, it is observed that a charge of $2.0 imes 10^{- 4}C$ flows into the coil. If the resistance of the coil is 80$\Omega$, the magnetic flux density in ${Wbm}^{- 2}$ is…….

Question

If a coil of 40 turns and area 4.0 ${cm}^{2}$ is suddenly removed from a magnetic field, it is observed that a charge of $2.0 	imes 10^{- 4}C$ flows into the coil. If the resistance of the coil is 80$\Omega$, the magnetic flux density in ${Wbm}^{- 2}$ is…….

Dr. Abubacker · Accepted Answer

(b) $q = \frac{N}{R}\phi = \frac{N}{R}(BA)$
$\Rightarrow B = \frac{qR}{NA} = \frac{2 	imes 10^{- 4} 	imes 80}{40 	imes 4 	imes 10^{- 4}} = 1Wbm^{- 2}$

Q. If a coil of 40 turns and area 4.0 ${cm}^{2}$ is suddenly removed from a magnetic field, it is observed that a charge of $2.0 \times 10^{- 4}C$ flows into the coil. If the resistance of the coil is 80$\Omega$, the magnetic flux density in ${Wbm}^{- 2}$ is…….

Explanation

Reviewed by Dr. Abubacker

Want more practice?