If the current in this circuit is 3 a, what must be the value of r3? it's 5 ω

5

Explanation:

Explanation :

It is given that,

In the given figure all the three resistors are in series.

Current flowing in the circuit,

Voltage,

We know that in series circuit the current flowing in all resistors is same.

Using Ohm's law, we get:

Hence, this is the required solution.    

we need to know the time interval during which the force acts. impulse of force = momentum change