Two charges are separated by 2 m and repel each other with a force of 20 n. if they are moved to a separation of 4 m, what will be the repulsive force?

Explanation:

It is given that,

Separation between the charges, r₁ = 2 m

Force between the charges, F₁ = 20 N

Separation between the charges finally, r₂ = 4 m

Let F₂ is the repulsive force. The formula for the repulsive force is given by :

So, the repulsive force is 5 newton. Hence, this is the required solution.

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27

explanation:

wheres the pic