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12th West Bengal Board
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For measurement of potential difference, potentiometer is preferred in comparison to voltmeter because

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Important Questions on Current Electricity

MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 5 - Current Electricity>EXERCISE 5>Q 46
In a potentiometer experiment the balancing length with a cell is 240cm. On shunting the cell with a resistance 2Ω the balancing length becomes The internal resistance of the cell is.
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 5 - Current Electricity>EXERCISE 5>Q 47
A potentiometer wire of length 10m and resistance 20Ω is connected in series with a 15V battery and an external resistance 40Ω. A secondary cell of emf E in the secondary circuit is balanced by 240cm long potentiometer wire. The emf of the cell is 
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12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 5 - Current Electricity>EXERCISE 5>Q 48

Shown in the Figure is a metre-bridge set up with null deflection in the galvanometer. The value of the unknown resistor R is 

Shown in the figure is a meter - bridge set up with null deflection in the galvanometer. The value of the unknown resistor R is

 

EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 5 - Current Electricity>EXERCISE 5>Q 49
In a potentiometer, the null point is received at 7 th wire. If now we have to change the null point at the 9 th wire, what should we do?
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12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 5 - Current Electricity>EXERCISE 5>Q 50
By mistake a voltmeter is connected in series and an ammeter is connected in parallel with a resistance in an electric circuit. What will happen to the instruments ?
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12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 5 - Current Electricity>EXERCISE 5>Q 51
In a Wheatstone network P=2Ω, Q=2Ω, R=2Ω and S=3Ω. The resistance with which S is to be shunted in order that the bridge may be balanced is 
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 5 - Current Electricity>EXERCISE 5>Q 52
Resistors P and Q are connected in the gaps of the metre bridge. The balancing point is obtained 13m from zero end. If a 6Ω resistance is connected in series with P, the balance point shifts to 23m from the same end. P and Q are 
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 5 - Current Electricity>EXERCISE 5>Q 53
When a metal conductor connected to the left gap of a metre bridge is heated, the balance point