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Problem 1. Two horizontal parallel conducting rods are connected such that a conducting crossbar free to...

Problem 1. Two horizontal parallel conducting rods are connected such that a conducting crossbar free to slide along them has a constant current I running through it (Fig. P27.34). The rods are separated by a distance l and are in an external uniform magnetic field of magnitude B directed out of the page. The crossbar has a length l and mass m. (a) In which direction will the magnetic force accelerate the crossbar? (b) If the coefficient of static friction between the rods and the crossbar is µs, find a formula for the minimum current I0 necessary for the crossbar to move. (c) Find the value of I0 if the magnetic field strength is 1.0 mT, the bar length is 1.0 cm, the bar mass is 10 g, and the frictional coefficient is 0.10

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