# q5_key - abdc is constant 1.6 Ω fnd the magnitude and the...

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PHY-2054C-002, Fall 2008 Instructor: Dr. Bhattacharya Quiz #5 KEY , Tuesday, Oct 07 1. The conduction rod ab as shown in the figure makes a frictionless contact with metal rails ca and db . The apparatus is in a uniform magnetic field of 1.2 T, perpendicular to the plane of the figure. x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x v B 50 cm d b a c (a) Find the magnitude of the emf induced in the rod when it is moving toward the right with a speed of 10 m/s. ε = vLB = 10 · 0 . 5 · 1 . 2 V = 6 V (b) In what direction does the current flow in the rod ? According to Lenz’s law the induced current will flow in an anticlockwise direction (to create the induced flux coming out of the paper). (c) If the resistance of the circuit
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Unformatted text preview: abdc is constant 1.6 Ω, fnd the magnitude and the direction oF the Force requires to keep the rod moving toward the right with the same constant velocity 10 m/s. The rod will experience a Force due to the induced current in presence oF the magnetic feld. Since the induced current ²ows From b to a , the direction oF this Force is toward leFt with magnitude ± induced = ILB = ε R LB = 6 1 . 6 · . 5 · 1 . 2 N = 2 . 25 N ∴ in order to keep the rod moving with constant velocity one needs to apply an external Force oF magnitude 2.25 N toward right....
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