Question

Two long parallel guide wires of zero resistance, separated by a distance d=1m, are connected to a potential difference ∆V = 3V. A bar of mass m=5kg and resistance R = 3Ω makes contact with these wires, and can slide along them without friction, always remaining perpendicular to the wires. An externally applied uniform magnetic field B=5T is perpendicular to the plane of the bar and the two wires. Find the velocity of the bar right after 2 seconds, assuming that the bar has an initial velocity of 1.2 m/s at time t=0. (Apply Faraday's Law, Ampere's Law, and Lenz's Law)

Answer #1

In the figure, five long parallel wires in the xy plane are
separated by distance d = 6.30 cm, have lengths of 10.0 m, and
carry identical currents of 3.52 A out of the page. Each wire
experiences a magnetic force due to the other wires. What is the
magnitude of the net magnetic force on (a) wire 1, (b) wire 2, (c)
wire 3, (d) wire 4, (e) wire 5?

A bar of resistance 4.2 -Ω slides along a pair of vertical
conducting poles separated by L=4.0 m and are electrically
connected at the base. The poles and the base have negligible
resistance. There is a constant magnetic field of strength B=0.15 T
perpendicular to the plane of the poles, in the direction into the
page.
If the bar is moving downward at v= 3 m/s, what emf is induced
in the bar?
What is the induced current?
If the...

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...

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