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The cell has an emf of 2V and the internal resistance of 3.9  the voltage across the cell will be

a)

1.95

b)

1.5V

c)

2V

d)

1.8V

Question ID - 151709 :-

The cell has an emf of 2V and the internal resistance of 3.9  the voltage across the cell will be

a)

1.95

b)

1.5V

c)

2V

d)

1.8V

1 Answer
5876 Votes
3537
Answer Key : (a) -

(a)

When a cell of emf E is connected to a resistance of 3.9 , then the emf E of the cell remains constant, while voltage V goes on decreasing on taking more and more current from the cell.

∴ 

Where, r is internal resistance.

Also, 

Putting the numerical values, we have


Next Question :

Two bulbs of 100 W and 200 W working at 220 V are joined in series with 220 V supply.  Total power consumed will be

a)

65 W

b)

33 W

c)

300 W

d)

100 W

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