A circular loop with radius Rcarries a current I. The loop is in a uniform field【图片】. If the magnetic flux passing through the loop is maximum, the torque on the loop is .
【单选题】Section BDirections: Beneath each of the following sentences, there are four choices marked[A],[B],[C]and[D]. Choose the one that best completes the sentence. Mark your answer on ANSWER SHEET 1 by bla...