See Fig. 2 of Assignment 8. A rod of mass 250 g and 75.0 cm long is suspended by

Question

See Fig. 2 of Assignment 8. A rod of mass 250 g and 75.0 cm long is suspended by two springs in a 3.50 T magnetic field, as shown. The weight of the road causes the springs to be in tension and they stretch a little. A current is now set up in the road and the magnitude and direction of the current is such that weight of the road is now offset and the tension in the springs is relaxed. Determine the magnitude of the current in the rod. Answer: 2.97 mA. 2.4 A. 6.54 mA. 1.97 mA 3.87 mA. The direction of the road is from Answer: Left to Right. Right to left.

Explanation / Answer

equate the force

Force due to gravity = force due to magnetic field

mg = BIl

0.25*9.81 = 3.5*0.75*I

I = 0.9342 A

direction is right to left

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