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Commercial Electrical Circuits

When 6 identi...

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When 6 identical cells of negligible internal resistance are connected in secondary circuit of a potentiometer the balancing length is 1 balancing length becomes 1/3 when some cells are connected wrongly the number of cells connected wrongly are

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identical cells of negligible internal resistance are connected in series in the secondary circuit of a potentiometer the balancing length is 'I', balancing length becomes 1/3 when some cells are connected wrongly , the number of cells connected wrongly are :

Q. 36 identical cell each having emf 1.5 volt and internal resistance

0.5 Ω

are connected in series with an external resistance of

12 Ω

.If 6 cells are wrongly connected then current through the circuit will be

12

cells each having same emf are connected in series with some cells wrongly connected. The arrangement is connected in series with an ammeter and two identical cells. Current is

3 A

when cells and battery aid each other and is

2 A

when cells and battery oppose each other. The number of cells wrongly connected is :-

Q. In potentiometer experiment a cell of emf. 1.5 V. connected in the secondary circuit gives a balancing length of 165cm of the wire. If a resistance of 5

Ω

is connected parallel to the cell, the balancing length of the wire is 150cm. The internal resistance of the cell is

Q. A potentiometer circuit has been set up for finding the internal resistance of a given cell. The main battery, used across the potentiometer wire, has an emf of

2 V

and a negligible internal resistance. The potentiometer wire is

4 m

long. When the resistance

R = 9.5 Ω

is connected across a secondary cell the balancing length on the potentiometer wire was found to be

2.85 m

. If the balancing length for the emf of the secondary cell is

3 m

, the value of internal resistance of the cell is

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