1. An oil drop has a mass of 4.95times 10^-15 kg experiencing a downward acceleration of 18.4m/s^2 Calculate the electric force.

Here's how to calculate the electric force on the oil drop:1. **Calculate the force due to gravity (weight):** Weight (W) = mass (m) * acceleration due to gravity (g) W = W = (downward)2. **Calculate the net force:** The oil drop is accelerating downwards, meaning the net force is downwards. The net force is the difference between the weight and the upward electric force (Fe). Net Force (Fnet) = mass (m) * acceleration (a) Fnet = Fnet = (downward)3. **Calculate the electric force:** Since the net force is downwards and greater than the weight, the electric force must be acting downwards as well. We can find the magnitude of the electric force by: Fnet = W + Fe Fe = Fnet - W Fe = Fe = (downward)Therefore, the electric force on the oil drop is **downwards**.