1. A particle with charge of 0.06 C is moving at right angles to a uniform magne
ID: 2039282 • Letter: 1
Question
1. A particle with charge of 0.06 C is moving at right angles to a uniform magnetic field with a strength of 0.5 T. The velocity of the charge is 600 m/s. What is the magnitude of magnetic force exerted on the particle? 2. A straight segment of wire has a length of 10 cm and carriers a current of 5 A. It is oriented at right angles to a magnetic field of 0.6 T. What's the magnitude of the magnetic force on this segment of wire? 3. A coil of wire with 80 turns has a cross-sectional area of 0.04 m2. A magnetic field of 0.6 T passes through the coil. a) What's the total magnetic flux passing through the coil? b) If the magnetic field disappears in 0.2 seconds, what's the average voltage induced in the coil (electromotive force)? 4. A step-down transformer is to be used to convert an ac voltage of 120 V to 6 V to power an electric train. If there are 300 turns in the primary coil, how many turns should there be in the secondary coil?Explanation / Answer
1) q = 0.06 C, B = 0.5 T, v = 600 m/s
F = qvB = 0.06*600*0.5
F = 18 N
2) L 10 cm , I = 5 A, B =0.6 T
F = ILB = 5*0.1*0.6
F = 0.3 N
3)N =80 , B = 0.6 T , A = 0.04 m^2,
(a) phi = NAB
= 80*0.04*0.6 = 1.92 T.m^2
(b) t = 0.2
V = (phi1-phi2)/t
V = (1.92-0)/0.2
V = 9.6 V
4) V1 =120 V, V2 = 6 V, N1 = 300
V1/V2 = N1/N2
120/6 = 300/N2
N2 = 15
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