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    Question

    The magnetic field inside a long straight solenoid

    is:
    A Zero Correct Answer Incorrect Answer
    B Non-uniform Correct Answer Incorrect Answer
    C Uniform Correct Answer Incorrect Answer
    D Increasing from center to ends Correct Answer Incorrect Answer

    Solution

    Inside a long straight solenoid, the magnetic field lines are parallel and evenly spaced, indicating a uniform field. The field is given by: B = μ₀nI Where μ₀ is permeability, n is number of turns per unit length, and I is current. Outside the solenoid, the field is nearly zero. So, the field inside is uniform.

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