A raindrop acquires a charge of 4 x 10-18 C as it falls. The force of attraction when the

raindrop is 5.2 m from the bulb on the end of a car antenna is 5 x 10-11 N. What is the charge

on the end of the car antenna?

Explanation:

The charge of the raindrop  Q =

The charge on the bulb (q) = ???

The force (F)  =

The separation of the raindrop from the bulb = 5.2 m

However, the force of attraction between the charge is given by the Coulomb's Law which is expressed as:

where:

Coulomb's constant (k) =

Therefore, the charge on the end of the car antenna =

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.