A circular coil enclosing an area A = 0.010 0 m2 is made of 145 turns of copper

Question

A circular coil enclosing an area A = 0.010 0 m2 is made of 145 turns of copper wire as shown in the figure below. Initially, a uniform magnetic field of magnitude B = 1.50 T points upward in a direction perpendicular to the plane of the coil. The direction of the field then reverses in a time interval ?t. Determine how much charge enters one end of the resistor during this time interval if R = 3.90 ?.

Explanation / Answer

? = ??/?t = N A ?B/?t = 145*0.010*(1.5-(-1.5))/?t = 4.35/?t >>>>>>>>>>>>>>>>>>>>>>> ? = i R = R ?Q/?t >>>>>>>>>>>>>>>>>>>>>>> 4.35/?t = 3.90 * ?Q/?t >>>>>>>>>>>>>>>>>>>>>>> 4.35 = 3.90 * ?Q >>>>>>>>>>>>>>>>>>>>>>> ?Q = 1.12 C

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