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A resistor R and another resistor 2R are connected in a series across a battery. If heat is produced at a rate of 10W in R, then in R it is produced at a rate of: A. 40 W
B. 20 W
C. 10 W
D. 5 W

Respuesta :

Answer:

Option B

Solution:

As per the question:

Heat produced at the rate of 10 W  

The resistor R and 2R are in series.

Also, in series, same current, I' passes through each element in the circuit.

Therefore, current is constant in series.

Also,

Power,[tex] P' = I'^{2}R[/tex]

When current, I' is constant, then

P' ∝ R

Thus

[tex]\frac{P'}{2R} = \frac{10}{R}[/tex]

P' = 20 W

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