The loop moves at a constant 1.0 cm/s. Plot a graph of the external force applied to the loop (to keep it moving at constant velocity) as a function of time. Plot it as an x-component (i.e., positive is to the right and negative is to the left). Label the axes with numerical values.

In Fig. 20.4, a square metal loop of side 4.0 cm and resistance 5.0 Ω moves to the right (+x-direction) into, through, and out of a 6.0 cm wide region of uniform magnetic field perpendicular to the plane of the loop. The magnetic field in the region is 0.25 T. At t = 0, the loop just begins to enter the region of magnetic field.

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