1. Tardigrade
  2. Question
  3. Physics
  4. 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 × 10-4 C flows into the coil. If the resistance of the coil is 80 Ω, the magnetic flux density in Wb / m 2 is

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

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 $Wb / m ^{2}$ is

Electromagnetic Induction

Solution:

$\Delta Q=\frac{\Delta \phi}{R}=\frac{n \times B A}{R}$
$\Rightarrow B=\frac{\Delta Q \cdot R}{n A}=\frac{2 \times 10^{-4} \times 80}{40 \times 4 \times 10^{-4}}=1\, Wb / m ^{2}$