JEE Main20208 Jan 2020Morning ShiftPhysicsElectromagnetic InductionActual
At time t = 0 magnetic field of 1000 G a u s s is passing perpendicularly through the area defined by the closed loop shown in the figure. If the magnetic field reduces linearly to 500 G a u s s , in the next 5 s , then induced E M F in the loop is:
Options
- A56 μ V
- B28 μ V
- C48 μ V
- D36 μ V
Correct answer
A. 56 μ V
Step-by-step solution
ε = - d ϕ d t = - A d B d t ε = − Δ ϕ Δ t = A Δ B Δ t = 16 × 4 - 4 × 2 1000 - 500 5 × 10 - 4 × 10 - 4 = 56 × 500 5 × 10 - 8 = 56 × 10 - 6 V