A negative charge of -2 C and a positive charge of 4 C are separated by 84,681 m. What is the force between the two charges?

-10N

Explanation:

Given that,

negative charge (q1) = -2 C

positive charge (q2) = 4 C

Distance between charges (r) = 84,681 m

force between the two charges (F) = ?

Apply the formula for

F= (kq1q2) / r^2

Recall that k is Coulomb's constant with a value of 9 × 10^9 Nm2C−2

Then,

F = (9 × 10^9 Nm2C−2 x -2C x 4C) / (84,681 m)^2

F = (-7.2 x 10^10) / (84,681 m)^2

F = -9.998N (Rounded up to nearest whole number as -10N)

Thus, the force between the two charges is -10 newton

answer: option c. i.e. electric current flowing “downhill” from the negative electrode to the positive electrode in a battery

explanation:

the water analogy to the circuits define the pipes (water flows) to the electric current. now, we know that the electric current flows from the positive terminal to the circuit (as shown in the diagram attached).

hence, option c is the correct answer.