HW 2 Electrostatic Force & Electric FieldsName:______

1.Two positive point charges Q1 and Q2 are separated by a distance R. If the charge Q1 experiences a force of magnitude F when the separation is R, how is the force on the charge Q1 changed when the separation is 3R ?

2.Two positive point charges Q1 and Q2 are separated by a distance R. Initially, each charge experiences a force of magnitude F. If the charges on Q1 and Q2 each double in magnitude, how will the force between them change?

3.Two positive point charges Q1 and Q2 are separated by a distance R. Initially, each charge experiences a force of magnitude F. If the charges on Q1 doubles and the distance between the charges also doubles, how will the force on charge Q2 change?

4. Determine the electrical force of attraction between two balloons that are charged with the opposite type of charge but the same quantity of charge. The charge on the balloons is 6.0 x 10-7 C and they are separated by a distance of 0.50 m

5.Joann has rubbed a balloon with wool to give it a charge of -1.0 x 10-6 C. She then acquires a plastic golf tube with a charge of +4.0 x 10-6 C localized at a given position. She holds the location of charge on the plastic golf tube a distance of 50.0 cm above the balloon. Determine the electrical force of attraction between the golf tube and the balloon

6.Two protons (p1 and p2) and an electron (e) lie on a straight line, as shown.

What is the direction of the overall electric force on …

a) p1

b) e

c) p2

7. Describe what is wrong with this diagram of an electric field.

8. Identify whether each of the charges shown are + or –

9. Observe the electric field lines and rank the magnitude of each charge from smallest to highest.

10. The diagram shows a positive charge Q and a negative charge –Q with the same magnitude.

The electric field at point P on the perpendicular bisector of the line joining them is:

a. /  / b. /  / c. /  / d. /  / e. / zero

11. The distribution of electric field lines in a certain region of space varies as shown in the figure.

The magnitude of the electric field in this region

A. increases in the downward direction.

B. decreases in the downward direction.

C. increases to the right

D. decreases to the right