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Q. A conductor consists of a circular loop of radius R and two straight, long sections. The wire lies in the plane of the paper and carries a current I. Find an expression for the vector magnetic field at the center of the loop. (Use mu_0 for µ0, pi for π, I, and R as necessary.)

Q. A 3.0 {rm{ cm}} times 3.0 {rm{ cm}} parallel-plate capacitor has a 3.0 {rm mm} spacing. The electric field strength inside the capacitor is 1.1×105 {rm{ V/m}}. What is the potential difference across the capacitor?

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