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Two cells , each of emf E and internal r...

Two cells , each of `emf E` and internal resistance `r`, are connected in parallel across a resistor `R`. The power delivered to the resistor is maximum if `R` is equal to

A

`R=r/2`

B

`R=r`

C

`R=2r`

D

`R=4r`

Text Solution

Verified by Experts

The correct Answer is:
D
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MOTION-CURRENT ELECTRICITY-EXERCISE -4 (Level -II)
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  10. Consider a thin square sheet of side L and thickness t, made of a mate...

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  11. Incandescent bulbs are designed by keeping in mind that the resistance...

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  12. To verify Ohm's law, a student is provided with a test resistor RT, a ...

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  13. When two identical batteries of internal resistance 1Omega each are co...

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  14. A meter bridge is set up as shown, to determine an unknown resistance ...

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  15. Two batteries of different emfs and different internal resistances are...

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  16. For the resistance network shown in the figure , choose the correct op...

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  17. Two ideal batteries of emf V(1)andV(2) and these resistances R(1),R(2)...

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  18. Heater of an electric kettle is made of a wire of length L and diamete...

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  19. A galvanometer gives full scale deflection with 0.006 A current . By c...

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