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Question 28

From Physics HL Paper 1A (May 2025, TZ1)

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  1. Charge is moving in a wire that is at right angles to a uniform magnetic field.
    The length of the wire is 0.32 m0.32\text{ m}.
    When the current in the wire is increased by 5.0 A5.0\text{ A}, the force acting on the wire increases by 4.0 mN4.0\text{ mN}.
    What is the strength of the magnetic field?

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