EASY
12th Telangana Board
IMPORTANT
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What is potential gradient? On what factors does it depend?  

Important Questions on Current Electricity

EASY
12th Telangana Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 6 - Current Electricity>Exercise>Q 47
What do you mean by the standardisation of potentiometer? Explain it by drawing a circuit diagram. 
EASY
12th Telangana Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 6 - Current Electricity>Exercise>Q 48
What do you mean by calibration of a voltmeter? 
MEDIUM
12th Telangana Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 6 - Current Electricity>Exercise>Q 49
In a potentiometer experiment, the balancing length for two cells of emf E1 and E2 E1>E2 connected in series is observed as 60 cm. On reversing the position of terminals of one cell (of smaller emf) in the arrangement of experiment, the new balancing length is observed as 20 cm. Find the ratio of EMFs E1/E2 of the cells?
HARD
12th Telangana Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 6 - Current Electricity>Exercise>Q 50
A battery of emf 10 V and internal resistance 2 Ω is connected in primary circuit with a uniform potentiometer wire and a rheostat whose resistance is fixed at 998 Ω. A battery of unknown emf is being balanced on this potentiometer wire and balancing length is found to be 50 cm. When the area of cross-section of potentiometer wire is doubled, then balancing length is found to be 75 cm. Calculate resistivity of potentiometer wire if the length of wire is 100 cm and area of cross-section (initially) is 100 cm2.
HARD
12th Telangana Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 6 - Current Electricity>Exercise>Q 51
A potentiometer wire has a length of 2m and resistance 10Ω. It is connected in series with resistance 990Ω and a cell of e.m.f. 2V. Calculate the potential gradient along the wire.
EASY
12th Telangana Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 6 - Current Electricity>Exercise>Q 52

In a meter bridge shown in the figure, the balance point is found to be at 39.5 cm from the end A when the resistor X is of 8.16 Ω and Y is of 12.5 Ω.

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Determine the balance point of the bridge above, if X and Y get interchanged.

EASY
12th Telangana Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 6 - Current Electricity>Exercise>Q 53
On what principle, meter bridge works.
EASY
12th Telangana Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 6 - Current Electricity>Exercise>Q 54
How is the resistance of a wire determined with the help of a meter bridge? Obtain the required formula and draw a circuit diagram.