Question

1- A 10.0-W resistor and a 20.0-W resistor are connected in series with a potentiometer and a 9.0-V battery.
What should the potentiometer be set at for a total equivalent resistance of 50.0 W in this circuit?
a. 10 Ω
b. 20 Ω
c. 30 Ω
d. 50 Ω

2-Batteries are most often connected in

a. series.
b. parallel.
c. both series and parallel.
d. neither series nor parallel.

(i think parallel)

3- A 9.0-V battery delivers a 1.3-A current to an electric motor. How much power is delivered to the motor?

a. 8.2 W
b. 9.9 W
c. 11 W
d. 12W

4-While many properties are similar, one important difference between electrostatic and gravitational forces is that unlike gravity, electric charge

a. can be transferred.
b. operates at a distance.
c. obeys an inverse-square law.
d. remains constant over time.

5- Using known values of E and B, Thomson measured the deflection of the electron beam and was able to calculate the ___________ of an electron.

a. force
b. strength
c. mass
d. path

6-A wire 15 m long moves through a magnetic field of 1.0 T. The wire moves at a constant speed of 5.7 m/s in a direction perpendicular to the magnetic field. What EMF is induced in the wire?

a. 2.6 V
b. 86 V
c. 43 V
d. 61 V

7-The magnitude of the current in a wire is _________ to the magnetic field around the wire.

a. equal
b. proportional
c. inversely proportional
d. parallel

Answer 1