Question

1.

Three charges are fixed to an xy coordinate system. A charge of +22C is on the y axis at y = +4.1 m. A charge of -14C is at the origin. Lastly, a charge of +45C is on the x axis at x = +4.1 m. Determine (a) the magnitude and (b) direction of the net electrostatic force on the charge at x = +4.1 m. Specify the direction as a positive angle relative to the +x axis.

(a)

Number

Units

(b)

Number

Units

2.

Two charges, -16 C and +4.6 C, are fixed in place and separated by 2.7 m. (a) At what spot along a line through the charges is the net electric field zero? Give the distance of the spot to the positive charge in meters (m). (Hint: The spot does not necessarily lie between the two charges.) (b) What would be the force on a charge of +14 C placed at this spot?

(a)

Number

Units

(b)

Number

Units

3.

Drawings A and B show two examples of electric field lines. Which (one or more) of the following statements are true?

In both A and B the electric field is the same everywhere.

As you move from left to right in each case, the electric field becomes stronger.

The electric field in A is the same everywhere, but it becomes stronger in B as you move from left to right.

The electric fields in both A and B could be created by negative charges located somewhere on the left and positive charges somewhere on the right.

Both A and B arise from a single positive point charge located somewhere on the left.

please help

Answer 1

1) We know that the electric force between two point charges Q1 and Q2 separated by a distance d is given by

F=kQ1Q2/d^2 where k=9×10^9 Nm2/C2