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
B 8.75 × 10⁻⁶ T
C 8.85 × 10⁻⁶ T
D 7.85 ×10⁻⁶ T
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