i. Show that a current-carrying loop placed in a magnetic field experiences a torque. Find the mathematical expression for the torque.ii. How fast must a proton of mass 1.67x10-27 kg be moving if it is to follow a circular path of radius 2.0cm in a magnetic field of 0.70 G.

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i. Show that a current-carrying loop placed in a magnetic field experiences a torque. Find the mathematical expression for the torque.ii. How fast must a proton of mass 1.67x10-27 kg be moving if it is to follow a circular path of radius 2.0cm in a magnetic field of 0.70 G.