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Force needed to pull a 1 m rod at constant speed along rails in a field

The same question, asked 2 times: 10 Apr 2023*, 21 Jan 2026 S1. Every wording below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    10 Apr 2023

    25
    A 1 m1\text{ }m long metal rod XYXY completes the circuit as shown in figure. The plane of the circuit is perpendicular to the magnetic field of flux density 0.15 T0.15\text{ }T. If the resistance of the circuit is 5Ω5\Omega, the force needed to move the rod in direction, as indicated, with a constant speed of 4 m/s4\text{ }m/s will be__ ×10−3 N\times 10^{- 3}\text{ }N.

  2. Question 2

    21 Jan 2026 S1

    16
    A 1 m long metal rod AB completes the circuit as shown in figure. The area of circuit is perpendicular to the magnetic field of 0.10 T. If the resistance of the total circuit is 2Ω2\Omega then the force needed to move the rod towards right with constant speed (v) of 1.5 m/s1.5\text{ }m/s is ____\_\_\_\_ N.

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