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10 May, 10:02

10-cm-long wire is pulled along a U-shaped conducting rail in a perpendicularmagnetic field. The total resistance of the wire and rail is 0.20 Ω. Pulling the wire with aforce of 1.0 N causes 4.0 W of power to be dissipated in the circuit.

What is the speed of the wire when pulled with a force of 1.0 N?

What is the strength of the magnetic field?

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  1. 10 May, 10:28
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    Answer: Speed = 4m/s

    Strength = 7.1T

    Explanation: P = 4.0w

    N = 1.0

    V=?

    Power = force x velocity

    Velocity = power / force

    V = 4.0w/1.0N

    V = 4m/s

    Strength of the magnetic field

    B = √PR / lv

    Where; l = length 10cm

    R = 2.0

    P = 4.0w

    V = 4m/s

    B = √ (4.0w) * (2.0) / (10cm) * (4m/s)

    B = 7.1T
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