29. ••• A rectangular wire loop with a cross-sectional area of 0.20 m2 carries a current of 0.25 A. The loop is free to rotate about an axis that is perpendicular to a uniform magnetic field of 0.30 T. The plane of the loop is at 30° to the direction of the field.

(a) What is the magnitude of the torque on the loop?

(b) How would you change the field to double the torque in (a)?

(c) Instead, how would you change only the current to double the torque in (a)?

(d) Instead, how would you double the torque by changing only the loop area, and what would the new area be?

(e) Could you double the torque in

(a) by changing only the angle? Explain.