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    Question

    A wire carrying a current of 4.0 A is shaped into a

    circular arc of radius 8.0 cm. If the arc subtends an angle of 90° at the center, what is the magnitude of the magnetic field produced at the center of the arc?
    A 5.87 × 10⁻⁶ T Correct Answer Incorrect Answer
    B 8.75 × 10⁻⁶ T Correct Answer Incorrect Answer
    C 8.85 × 10⁻⁶ T Correct Answer Incorrect Answer
    D 7.85 ×10⁻⁶ T Correct Answer Incorrect Answer

    Solution

    To find the magnetic field at the center of a circular arc carrying current, we use the formula:

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