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6 May, 09:45

Coiling wire around an iron core and applying an electric current through the wire creates a temporary magnet called an electromagnet. What would increase the strength of an electromagnet? A) Use a smaller nail. B) Use a battery with less voltage. C) Use a battery with more voltage. D) Use fewer coils of wire around the nail.

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  1. 6 May, 11:06
    0
    C) Use a battery with more voltage.

    Explanation:

    The equation for the magnetic field around a coil is given by,

    B = μ₀NI

    where,

    B = Magnetic flux density

    μ₀ = permeability

    N = number of turns per meter

    I = Current in the wire

    So when using a higher voltage battery, more current passes through the battery as resistance of the wire remains the same.
  2. 6 May, 12:52
    0
    C) Use a battery with more voltage.

    Explanation:

    To increase the strength of the electromagnet use a battery with more voltage.
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