In Figure P20.63, the rolling axle, 1.50 m long, is pushed along horizontal rails at a constant speed v = 8.00 m/s. A resistor R = 0.402 is connected to the rails at points a and b, directly opposite each other. (The wheels make good electrical contact with the rails, so the axle, rails, and R form a closed-loop circuit. The only significant resistance in the circuit is R.) A uniform magnetic field B = 0.1200 T is directed vertically downwards.
Figure P20.63
http://www.webassign.net/sercp/p20-63.gif
(a) Find the induced current I in the resistor.
A
(b) What horizontal force is required to keep the axle rolling at constant speed?
N
2007-03-14 06:51:35 · 1 answers · asked by tiggerx313 1 in Science & Mathematics ➔ Physics
(a)induced current=induced emf / resistance
induced emf =magnetic field x axle length xspeed
induced current=0.12 x 1.5 x 8 / 0.402 = 3,58 ampere
(b)force=magnetic field x current x length of axle=0.12x3.58x1.5=0.64 newton
2007-03-14 08:06:21 · answer #1 · answered by ukmudgal 6 · 3⤊ 0⤋