# Quizbank/Electricity and Magnetism (calculus based)/QBCh7

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QB153086031104

### QB:Ch 7:V1[edit]

QB153086031104

1) An electron gun has parallel plates separated by 3.02 cm and gives electrons 39 keV of energy. What force would the field between the plates exert on a 0.699 μC charge that gets between the plates?

- a) 8.206E-01 N
- b) 9.027E-01 N
- c) 9.930E-01 N
- d) 1.092E+00 N
- e) 1.201E+00 N

2) When a 7.78 V battery operates a 1.35 W bulb, how many electrons pass through it each second?

- a) 7.397E+17 electrons
- b) 8.137E+17 electrons
- c) 8.951E+17 electrons
- d) 9.846E+17 electrons
- e) 1.083E+18 electrons

3) A diploe has a charge magnitude of q=7 nC and a separation distance of d=4.08 cm. The dipole is centered at the origin and points in the y-direction as shown. What is the electric potential at the point (x=3.16 cm, y=2.04 cm)? Note that following the textbook's example, the y-value of the field point at 2.04 cm matches the disance of the positive charge above the x-axis.

- a) 7.017E+02 V
- b) 7.718E+02 V
- c) 8.490E+02 V
- d) 9.339E+02 V
- e) 1.027E+03 V