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The resistance of an ideal voltmeter is.

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Important Questions on Current Electricity

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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 42
To send 10% Of main current through a moving coil galvanometer of resistance 99Ω Shunt required is 
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12th West Bengal Board
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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 5 - Current Electricity>EXERCISE 5>Q 43
To verify Ohm's law, a student is provided with a test resistor RT, A high resistance R1, A small resistance R2, Two identical galvanometers G1 and G2, and a variable voltage source V.The correct circuit in Fig.5.190 To carry out the experiment is.
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12th West Bengal Board
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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 5 - Current Electricity>EXERCISE 5>Q 44

Three voltmeters A,B and C Having resistances R, 1.5 R, 3R Respectively are used in a circuit as shown Fig.191. When a potential difference is applied between X and Y, The readings of the voltmeters V1,V2 and V3 Respectively. Then 

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12th West Bengal Board
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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 5 - Current Electricity>EXERCISE 5>Q 45
For measurement of potential difference, potentiometer is preferred in comparison to voltmeter because
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12th West Bengal Board
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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.
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12th West Bengal Board
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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
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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

 

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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 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?