Answer to Question #51632 in Electricity and Magnetism for samuel

Question

1. A uniform electric field of 200 N/C is in the x-direction. A point charge of 3μC is released from rest at the origin. What is the kinetic energy of the charge when it is at x = 4 m?


a. 2.4×10 −2 J



b. 1.6×10 −2 J



c. 3.6×10 −2 J



d. 4.8×10−2J

2, Two large horizontal metal plates are separated by 4 mm. The lower plate is at a potential of
−6V
. What potential should be applied to the upper plate to create electric field strength of 4000 V/m upwards in the space between the plates?


a. +22V



b. +10V



c. −10V



−22V


3. An ac circuit consists of a voltage source v=200sin120πt and a 6μF capacitor in series. Calculate the current established in the circuit


a. 0.32A

b. 1.24A

c. 0.64A

d. 2.13A

4. Gauss’s law says that the net flux passing through a Gaussian sphere is equal to the charge enclosed divided by?

a.1
b. 1/ε 0
c. 0
d. ε 0