Electricity and Magnetism Answers

In 1955, a water bore that was 2231 m deep was drilled in Montana. Consider two

charges, q2 = 5.60 mC and q1, separated by a distance equal to the depth of the well. If

a third charge, q3 = 1.998 C, is placed 888 m from q2 and is between q2 and q1, this

third charge will be in equilibrium. What is the value of q1?

A charge is released from rest in a

uniform electric field with a magnitude of 4.5 × 10^3 V/m. The charge moves 350 cm as a

result. What is the potential difference between the charge’s initial and final positions?

Producing an electric spark in a factory furnace requires an electric field of 9.5 × 106 V/m. The

gap between electrodes in the ignition device is 8.5 mm. What minimum potential difference

must be supplied by the ignition device to start the furnace?

A charge q1 of +8.00 × 10−9 C and a charge q2 of +4.00 × 10−9 C are separated by a distance

of 60.0 cm. What is the equilibrium position for a third charge of

–25.0 × 10−9 C?

In the following figure, the particles have charges q1 = q2 = 100 nC and q3 =

− q4 = 200 nC, distance a = 5 cm. Find the electrostatic force on charge 4 in unit-

vector notation and magnitude-angle notation.