A circular loop of wire of resistance R = 0.500 V and radius r = 8.00 cm is in a uniform magnetic field directed out of the page as in Figure P20.54. If a clockwise current of I = 2.50 mA is induced in the loop, (a) is the magnetic field increasing or decreasing in time? (b) Find the rate at which the field is changing with time.

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Magnetic Force

A magnetic force arises when a charged particle or a current-carrying conductor is placed in a magnetic field. It is created because of the movement of the charged particles.