Home
Class 12
PHYSICS
Two cells, having the same emf, are conn...

Two cells, having the same emf, are connected in series through an external resistance `R`. Cells have internal resistance `r_(1)` and `r_(2) (r_(1) gt r_(2))` respectively. When the circuit is closed, the potential difference across the first cell is zero the value of `R` is

A

`(r_1+r_2)/2`

B

`(r_1-r_2)/2`

C

`r_1+r_2`

D

`r_1-r_2`

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Similar Questions

Explore conceptually related problems

Two sources of equal emf are connected to an external resistance R. The internal resistance of the two sources are R_(1) and R_(2) (R_(1) gt R_(1)) . If the potential difference across the source having internal resistance R_(2) is zero, then

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)

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)

According to this diagram , the potential difference across the terminals is ( internal resistance of cell =r)

Two sources of equal emf are connected in series and having different internal resistance r_1 and r_2(r_2gtr_1) . Find the external resistance R at which the potential difference across the terminals of one of the sources becomes equal to zero.

n identical cells, each of emf E and internal resistance r, are joined in series to form a closed circuit. Find the potential difference across any one cell.

Two cells of the same e.mf. e but different internal resistances r_(1) and r_(2) are connected in series with an external resistance 'R'. The potential drop across the first cell is found to be zero. The external resistance Ris

In the given circuit, if the potential difference across the internal resistance r_1 is equal to E, then the resistance R is equal to:

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

A cell of emf E has an internal resistance r & is connected to rheostat. When resistance R of rheostat is changed correct graph of potential difference across it is