Electrons are made to flow through the copper stripTwo horizontal parallel condu

Question

Electrons are made to flow through the copper stripTwo horizontal parallel conducting rods are connected such that a conducting crossbar free to slide along them has a constant current I running through it (Figure 1) .The rods are separated by a distance ? and are in an external uniform magnetic field of magnitude B directed out of the screen. The crossbar has a length ? andmass m.

Figure 1:

A: In which direction does the crossbar move?

- Toward the left?

-The direction constantly changes?

-Toward the right?

-None of the above.

B: If there is a coefficient of static friction ?s between rods and crossbar, what is the minimum current I0 necessary for the crossbar to move? For the length ? of the bar use the notation l.

Express your answer in terms of some or all of the variables l, B, m, ?s, and the acceleration due to gravity g.

Explanation / Answer

#A: cross bar moves to the right

#B:

apply frictional oforce uF = magnetic force iLB

so

us = i0LB/mg

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