8 questions of physics1

Use (10.1.1) with r = 0.01m. Were told that q1 = q2, so you can replace q2 by q1 and then

solve for q1.

2

Again use (10.1.1). You dont need to know the result of the last problem. We know

what the force at r = 0.01m is: F = 0.001N. Now we want to increase the distance to

rnew = 0.05m. To find out how this changes the force, form the ratio between the unknown

new force and the previous force:

Fnew =?

F

The charges q1 and q2 in the formula for Fnew and F are unchanged, so q1 and q2 cancel

in the ratio on the right-hand side. Only the ratio between r and rnew will appear and

you know its value. You should get a force thats a lot smaller than F from problem 1.

3

Again use (10.1.1). The mass in kg isnt relevant to the answer.

4

Again use (10.1.1), making sure to use meters and not km for the distance r. Also state if

the force is force is attractive or repulsive.

5

Again use (10.1.1): solve for r.

7

Use (10.2.1)

10

Again use (10.2.1): solve for the field by dividing both sides by the charge (also specify the

direction of the field).

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8 questions (Essentials of physics)

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ESSENTIALS OF PHYSICS, PHYS 102

HOMEWORK 1

Please draw a box around each of your final answers, like THIS .

DUE by 4:30 pm, Wednesday April 11, online through Canvas. If late (up to 24 hrs

maximum, 4:30 pm), score is reduced by 80%.

1 Textbook problems (10 points each):

1

Hints

1

Use (10.1.1) with r = 0.01m. Were told that q1 = q2 , so you can replace q2 by q1 and then

solve for q1 .

2

Again use (10.1.1). You dont need to know the result of the last problem. We know

what the force at r = 0.01m is: F = 0.001N. Now we want to increase the distance to

rnew = 0.05m. To find out how this changes the force, form the ratio between the unknown

new force and the previous force:

Fnew

=?

F

The charges q1 and q2 in the formula for Fnew and F are unchanged, so q1 and q2 cancel

in the ratio on the right-hand side. Only the ratio between r and rnew will appear and

you know its value. You should get a force thats a lot smaller than F from problem 1.

3

Again use (10.1.1). The mass in kg isnt relevant to the answer.

4

Again use (10.1.1), making sure to use meters and not km for the distance r. Also state if

the force is force is attractive or repulsive.

5

Again use (10.1.1): solve for r.

7

Use (10.2.1)

10

Again use (10.2.1): solve for the field by dividing both sides by the charge (also specify the

direction of the field).

2

…

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