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.    

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.

d. platinum would have the greatest temperature increase because it has the lowest specific heat.