Home
Class 12
PHYSICS
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=0`

Text Solution

Verified by Experts

The correct Answer is:
A
Power delivered to the resistor is R or current through R is maximum when total internal resistance of the circuit is equal to the external resistance i.e. `R=r//2`.
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    NIKITA PUBLICATION|Exercise Multiple Choice Questions|314 Videos

  • COMMUNICATION SYSTEMS

    NIKITA PUBLICATION|Exercise Multiple Choice Questions (Examples for Practice)|8 Videos

  • ELASTICITY

    NIKITA PUBLICATION|Exercise MCQ|314 Videos

Similar Questions

Explore conceptually related problems

4 cells each of emf 2 V and internal resistance of 1Omega are connected in parallel to a load resistor of 2Omega . Then the current through the load resistor is

Four cells, each of emf E and internal resistance r, are connected in series across an external resistance reverse. Then, the current in the external circuit is

An external resistance R is connected to a battery of e.m.f. V and internal resistance r . The joule heat produced in resistor R is maximum when R is equal to

Two cells of emf E_1 and E_2 having internal resistance r _1 and r_2 are connected in parallel. Calculate Eeq and req for the combination.

Two cells of emf E each and internal resistance r_(1) and r_(2) are connected in series across a load resistance R. If potential difference across the first cell is zero, then find the relation between R, r_(1) and r_(2)

A battery of e.m.f. E and internal resistance r is connected to a variable resistor R as shown here. Which one of the following is true

A battery is of emt E and internal resistance r . The value of external resistance R so that the power across eternal resistance is maximum :

A cell of emf epsilon and internal resistance r is connected across a load resistance R (i) Find the maximum power delivered at the load ? (ii) Draw the power (P ) vs load resistance ( R ) graph.

NIKITA PUBLICATION-CURRENT ELECTRICITY-Multiple Choice Questions
  1. The current capacity of a charged secondary cell depends upon

    Text Solution

    |

  2. A certain electric circuit with a resistance R is supplied power simu...

    Text Solution

    |

  3. Two cells , each of emf E and internal resistance r, are connected in ...

    Text Solution

    |

  4. The relation between current and potential difference is given by

    Text Solution

    |

  5. Ohm's law is true for

    Text Solution

    |

  6. The V - I graph for a conductor makes angle theta with V-axis. Here V ...

    Text Solution

    |

  7. Ohm's law is applicable to

    Text Solution

    |

  8. Ohm's law is valid, when the temperature of the conductor is

    Text Solution

    |

  9. When the potential difference applied across a solid conductor is incr...

    Text Solution

    |

  10. In case of liquids, the Ohm's law is

    Text Solution

    |

  11. For the validity of Ohm's law, which of following quantity is constant...

    Text Solution

    |

  12. If the physical state of the conductor remains unchanged then the curr...

    Text Solution

    |

  13. Ohm's law is not applicable for

    Text Solution

    |

  14. In a closed circuit, the e.m.f. and internal resistance of the generat...

    Text Solution

    |

  15. Which of the following is mathematical equation of Ohm's law ?

    Text Solution

    |

  16. An external resistance R is connected to a cell of internal resistance...

    Text Solution

    |

  17. Ohm is the S.I. unit of

    Text Solution

    |

  18. The reciprocal of resistance is

    Text Solution

    |

  19. If a potential difference of 1 volt applied across the conductor cause...

    Text Solution

    |

  20. S.I. unit of conductance is

    Text Solution

    |