the electric field have to be to produce a force that will cancel out the force
ID: 2124329 • Letter: T
Question
the electric field have to be to produce a force that will cancel out the force from the magnetic field? as shown in the figure, a wire and a 10-ohm resistor are used to form a circuit in the shape of a square, 20 cm by 20 cm a uniform but nonsteady magnetic field is directed into the plane of the circuit. The magnitude of the magnetic field is decreased from 1.50 T to 0.50 T in a time interval of 63 ms. what b the current induced in the wire and m which direction does n travel through the resistor?Explanation / Answer
q1q2 answer :
1. ELETRIC force = magnetic force
i.e Eq = qvB
E = vB
E = 9.1*10^4 * 0.8
E =7.28 *10^4 N/C
2, induced emf e = NAdB/dt
e = 0.2*0.2* (1.5-0.5)/0.063
e = 0.635 volts
induced current i = e/R = 0.635/10 = 0.0635 A
3.efficiency e = 1-T2/T1 = 1- 300/500 =40 %
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