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12th Andhra Pradesh Board
IMPORTANT
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Obtain balancing condition in case of Wheatstone's network.

Important Questions on Current Electricity

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12th Andhra Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 6 - Current Electricity>Exercise>Q 38

The potentiometer wire AB shown in the figure (32-E27) is 50 cm. AD=30 cm, no deflection occurs in the galvanometer. Find R.

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HARD
12th Andhra Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 6 - Current Electricity>Exercise>Q 39
Four resistance 4 ,4 , 4 and12Ω form a Wheatstone's network. Find the resistance which when connected across the 12Ω resistance, will balance the network.
MEDIUM
12th Andhra Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 6 - Current Electricity>Exercise>Q 40
What is Wheatstone bridge, derive its balanced condition for balance using Kirchhoff's law.
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12th Andhra Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 6 - Current Electricity>Exercise>Q 41
Why potential gradient of potentiometer depends on the temperature of wire? 
MEDIUM
12th Andhra Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 6 - Current Electricity>Exercise>Q 42
What happens if the emf of cell in the primary circuit is less than the emf of cell in the secondary circuit ? 
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12th Andhra Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 6 - Current Electricity>Exercise>Q 43
Why area of cross section of the potentiometer wire should be uniform?
EASY
12th Andhra Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 6 - Current Electricity>Exercise>Q 44
How the sensitivity of potentiometer can be increased?
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12th Andhra Pradesh Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 6 - Current Electricity>Exercise>Q 45
Why copper wire is not used in potentiometer?