Question 1 A +5 coulomb charge is placed 10 m from a second charge. The force be

Question

Question 1

A +5 coulomb charge is placed 10 m from a second charge. The force between the charges is 9 x 108 N and is attractive. The second charge is:

- .20 C

+.20 C

-2.0 C

+2.0 C

-5.0 C

Question 2

Three capacitors are identical. They can be connected in a series or a parallel or a series parallel arrangement. If you want the smallest equivalent capacitance for the combination you

use all three in parallel.

use all three in series.

use one in series with the other two in parallel to it.

use a single capacitor.

Question 3

The energy stored in a capacitor is U1. If the charge is doubled and the capacitance is halved, the new energy stored U2 will be:

U2=8U1

U2=U1/4

U2=4U1

U2=U1/8

Question 4

Electric potential is the phrase we use to mean electrical potential energy per unit charge.

True

False

Question 5

A point charge is placed in a non-constant electric field. No force is exerted on this charge:

At locations where the electric field strength is zero

At locations where the electric field strength is 9x10-9 N/C

If the charge is accelerating

If the field is caused by an equal amount of positive and negative charges.

- .20 C

+.20 C

-2.0 C

+2.0 C

-5.0 C

Explanation / Answer

1.A +5 coulomb charge is placed 10 m from a second charge. The force between the charges is 9 x 108 N and is attractive. The second charge is:

F = kq1q2/r^2
9x10^8 = k * 5* q2/100
q2 = 20 C

2. use all three in series.

3. The energy stored in a capacitor is U1. If the charge is doubled and the capacitance is halved, the new energy stored U2 will be:

Q =CV
2Q = 0.5CV2
V2 = 4V
U2 = 0.5CV^2 = 0.5 *0.5 C* 16V^2 = 4U1

4. True

5.If the field is caused by an equal amount of positive and negative charges

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