Electricity and Magnetism Answers

1. Two equal positive charges q1 q2 = 4.0 μC are located at (1.20 m, 0) and (-1.20 m, 0), = respectively. What are the magnitude and direction of the total electric force that q1 and q2 exerts on a third charge q3= 7.0 μC located at (0, -0.50 m) ?

2. In problem #1, find the total electric field at (0, -0.50 m).

Two equal positive charges q1 q2 = 4.0 μC are located at (1.20 m, 0) and (-1.20 m, 0), = respectively. What are the magnitude and direction of the total electric force that q1 and q2 exerts on a third charge q3= 7.0 μC located at (0, -0.50 m) ?

What is the magnitude of the force that a 25μC-charge exerts on a 10μC charge {\rm 8.5\, cm}8.5cm away? (Take k=9×106^9 N.m^2/C^2)

What is the magnitude of the force that a 25μC-charge exerts on a 10μC charge {\rm 8.5\, cm}8.5cm away? (Take k=9×109 N.m2/C2)

(2 uF)(-5 uF)

Three capacitors with capacitances 4 F, and 12 F are connected in series. A voltage of 400V is applied to the combination.Find the charge in each capacitor.(IN C)

Find the charge stored in a capacitor with a capacitance of 50 uF and a potential difference of 10 V.( In C and uC)

In the circuit shown in Fig. Q28.14, when switch S is suddenly closed, the wire L is pulled toward the lower wire carrying current I. Which (a or b) is the positive terminal of the battery? How do you know?

An ordinary loudspeaker such as that shown in Fig. 27.28 should not be placed next to a computer monitor or TV screen. Why not?

At any point in space, the electric field E is defined to be in the direction of the electric force on a positively charged particle at that point. Why don’t we similarly define the magnetic field to B to be in the direction of the magnetic force on a moving, positively charged particle?