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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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