Home
Class 12
PHYSICS
Four cells each of emf E are internal re...

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

A

`(2E)/(4r+R)`

B

`(3E)/(4r+R)`

C

`(3E)/(3r+R)`

D

`(2E)/(3r+R)`

Text Solution

Verified by Experts

The correct Answer is:
A
Current in the circuit `I=(3E-E)/(4r+R)=(2E)/(4r+R)`
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    CHHAYA PUBLICATION|Exercise EXAMINATION ARCHIVE WITH SOLUTIONS(JEE MAIN)|4 Videos

  • CURRENT ELECTRICITY

    CHHAYA PUBLICATION|Exercise EXAMINATION ARCHIVE WITH SOLUTIONS(AIPMT)|2 Videos

  • CURRENT ELECTRICITY

    CHHAYA PUBLICATION|Exercise EXAMINATION ARCHIVE WITH SOLUTIONS(WBCHSE)|18 Videos

  • COMMUNICATION STSTEM

    CHHAYA PUBLICATION|Exercise CBSE SCANNER|28 Videos

  • DIFFRACTION AND POLARISATION OF LIGHT

    CHHAYA PUBLICATION|Exercise CBSE SCANNER|27 Videos

Similar Questions

Explore conceptually related problems

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

Two cells each of emf e but internal resistance r_1 and r_2 are connected in series through an external resistance R. IF the potential difference across the first cell is szero while current flow, the relation of R in terms of r_1 and r_2

Knowledge Check

  • Four' cells, each of elf E and internal resistance r, are connected in series across an external resistance R. By mistake one of the cells is connected in reverse. Then the current in the external circuit is

    A
    `(2E)/(4r+R)`
    B
    `(3E)/(4r+R)`
    C
    `(3E)/(3r+R)`
    D
    `(2E)/(3r+R)`

  • A cell of e.m.f. 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

    A
    `1/n`
    B
    `1/(n+1)`
    C
    `n/(n+1)`
    D
    `(n+1)/n`

  • Two cells each emf e but of internal resistance r_1 and r_2 are connected in series through and external resistance R. IF the potential difference across the first cell is zero while current flows the value of R in terms of r_1 and r_2 is

    A
    `R=r_1+r_2`
    B
    `R=r_1-r_2`
    C
    `R=1/2(r_1+r_2)`
    D
    `R=1/2(r_1-r_2)`

    • Similar Questions

    Explore conceptually related problems

    Two cells each of emf e but internal resistances r_1 and r_2 are connected in series through an external resistance R. IF the potential difference across the first cell is zero while current flows,the relation of R in terms of r_1 and r_2 is

    Two identical cells each of emf E and internal resistance r are connected in parallel with an external resistance R. To get maximum power developed across R, the value of R is

    A battery of emf E and internal resistance 'r' is connected to an external resistance 'R', the condition for maximum power transfer is

    Two electric cells each of emf 1.5 V and internal resistance 2 Omega are connected in parallel and this combiantion of cells is connected with an external distance of 2 Omega . What will be the current in the external circuit?

    Consider N=n_1n_2 identical cells, each of emf E and internal resisance r. Suppose n_1 cells are joined in series to form a line and n_2 such lines are connected in an external resistance R. The current in the external resistance is

    Home
    Profile