Home
Class 12
PHYSICS
Cell A has emf 2 E ad internal resistanc...

Cell A has emf 2 E ad internal resistance 4 r. Cell B has emf E and internal resistance r. The negative of A is connected to the positive of B and a load resistance of R is connected across the battery formed. If the terminal potential difference across A is zero, then R is equal to

A

`3r`

B

`2r`

C

`r`

D

`5r`

Text Solution

Verified by Experts

The correct Answer is:
C
`i=(E_(1)+E_(2))/(R+r_(1)+r_(2)),V_(1)=E_(1)-ir_(1)`
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    NARAYNA|Exercise NCERT Based Questions|13 Videos

  • CURRENT ELECTRICITY

    NARAYNA|Exercise Level 5|42 Videos

  • CURRENT ELECTRICITY

    NARAYNA|Exercise Level 2 H.W|45 Videos

  • COMMUNICATION SYSTEM

    NARAYNA|Exercise Level-II(H.W)|25 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    NARAYNA|Exercise ASSERTION AND REASON|15 Videos

Similar Questions

Explore conceptually related problems

In a connection of 10 dry cells each of emf E and internal resistance r in series, two cell is connected opposite. Net emf and net internal resistance will be:

A cell of e.mf. E and internal resistance r is connected in series with an external resistance nr. Then, the ratio of the terminal potential difference to E.M.F.is

Two batteries of E_(1) internal resistance r_(1) & emf E_(2) internal resistance r_(2) are connected in parallel and makes a battery system. An external resistance R is connected across this system as shown in the figure.

2A cell having an emf epsilon and internal resistance r is connected across a variable external resistance R . As the resistance R is increased, the plot of potential difference V across R is given by

A cell of emf E and internal resistance r is connected in series with an external resistance nr. Than what will be the ratio of the terminal potential difference to emf, if n=9.

NARAYNA-CURRENT ELECTRICITY-Level 3
  1. A heating element using nichrome connected to a 230 V supply draws an ...

    Text Solution

    |

  2. A group of N cells where e.m.f. varies directly with the internal resi...

    Text Solution

    |

  3. Cell A has emf 2 E ad internal resistance 4 r. Cell B has emf E and in...

    Text Solution

    |

  4. In the circuit shown in figure potential difference between point A an...

    Text Solution

    |

  5. Find the minimum number of cells required to produce a current of 1.5A...

    Text Solution

    |

  6. The p.d between the terminals A & B is

    Text Solution

    |

  7. the energy stored in the capacitor is

    Text Solution

    |

  8. Calculate the potentials of points A, B,C and D as shown in Fig. a. Wh...

    Text Solution

    |

  9. In the circuit in fig. If no current flows through the galvanometer wh...

    Text Solution

    |

  10. In the steady state, the energy stored in the capacitor is:

    Text Solution

    |

  11. A part of circuit in a steady state along with the currents flowing in...

    Text Solution

    |

  12. Equivalent resistace across A and B in the given circuit if r=10Omega,...

    Text Solution

    |

  13. for a cell, the graph between the p.d. (V) across the terminals of the...

    Text Solution

    |

  14. The charge developed on 4muF condenser is

    Text Solution

    |

  15. Find out the value of current through 2Omega resistance for the given ...

    Text Solution

    |

  16. Same mass of copper is drawn into 2 wires of 1 mm thick ad 3 mm thick....

    Text Solution

    |

  17. Masses fo three are in the ratio 1:3:5 their lengths are in the ratio ...

    Text Solution

    |

  18. A heater coil rated at 1000 W s connected to a 110 V mains. How much t...

    Text Solution

    |

  19. In the following circuit, 5Omega resistor develops 45 J/s due to curre...

    Text Solution

    |

  20. Two wires 'A' and 'B' of the same material have their lengths in the r...

    Text Solution

    |