The EMF is induced in the coil when it is moving in a uniform magnetic field,
e=Bvl and the current, i=Re⇒RBlv=0.002A
⇒v=Bl0.002×R=5×0.20.002×(4+1)=0.01ms−1=1cms−1.
A square loop of side 20 cm and resistance 1Ω is moved towards right with a constant speed v_0. The right arm of the loop is in a uniform magnetic…
JEE Main 2021 — Physics Electromagnetism
2021mcqmedium
A square loop of side 20cm and resistance 1Ω is moved towards right with a constant speed v0. The right arm of the loop is in a uniform magnetic field of 5T. The field is perpendicular to the plane of the loop and is going into it. The loop is connected to a network of resistors each of value 4Ω. What should be the value of v0 so that a steady current of 2mA flows in the loop ?
Official previous-year question
Held on 1 Sept 2021 · Verified 6 Jul 2026.
Options
- A
10−2cms−1
- B
1ms−1
- C
1cms−1
- D
102ms−1
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