i would like help with q 8 Physics 227/232 ODU Fall 2017 D.P. Weygand November 7
ID: 1776624 • Letter: I
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i would like help with q 8
Physics 227/232 ODU Fall 2017 D.P. Weygand November 7, 2017 Physics 227/232 ODU Name: 7) A point charge Q moves on the x-axis in the positive direction with a speed of 280 m/s. A point Pis on the y-axis at-= +70 mm. The magnetic field produced at the point P, as the charge moves through the origin, is equal to-03011T k. What is the charge Q? («0-47-10-7 T . m/A) A)-53 uC D) +39 uC E) +26 HC 8) A uniform magnetic field is applied perpendicular to the plane of a 60-turn circular coil with a radius of 6.0 cm and a resistance of 0.60 2. If the magnetic field increases uniformly from 0.20 T to 1.8 T in 0.20 s, what is the magnitude of the emf induced in the coil? A) 7.2 V B) 5.4 V C) 9.2 V D) 12 V E) 16 VExplanation / Answer
8)
Radius = 6.0 cm
induced emf is defiend as the rate of change of magnetic flux
in mathematical form,
induced emf e = NAdB/dt
where A = area
N = no. of tunrs = 60
dB/dt = rate of change of amgnetic flux
so emf = e = 60 * pi * 0.06*0.06 * (1.8 - 0.2)/0.2
emf = 5.4 volts
Option B) is correct.
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