Physics Standard 12>Chapter 9 - Current Electricity>Exercises>Q 1

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12th Maharashtra Board

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Four resistances $10 Ω, 10 Ω, 10 Ω$ and $15 Ω$ form a Wheatstone's network. What shunt is required across $15 Ω$ resistor to balance the bridge.

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Important Questions on Current Electricity

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12th Maharashtra Board

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Physics Standard 12>Chapter 9 - Current Electricity>Exercises>Q 1

A circular loop has a resistance of

40 Ω

. Two points P and Q of the loop, which are one quarter of the circumference apart are connected to a 24 V battery, having an internal resistance of

0.5 Ω

. What is the current flowing through the battery.

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Physics Standard 12>Chapter 9 - Current Electricity>Exercises>Q 1

To find the resistance of a gold bangle, two diametrically opposite points of the bangle are connected to the two terminals of the left gap of a metre bridge. A resistance of

4 Ω

is introduced in the right gap. What is the resistance of the bangle if the null point is at

20 cm

from the left end?

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Physics Standard 12>Chapter 9 - Current Electricity>Exercises>Q 2

Define or describe a Potentiometer.

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12th Maharashtra Board

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Physics Standard 12>Chapter 9 - Current Electricity>Exercises>Q 2

Write down the definition of potential gradient.

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12th Maharashtra Board

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Physics Standard 12>Chapter 9 - Current Electricity>Exercises>Q 2

Why should not the jockey be slided along the potentiometer wire?

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Physics Standard 12>Chapter 9 - Current Electricity>Exercises>Q 2

Are Kirchhoff s laws applicable for both AC and DC currents?

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12th Maharashtra Board

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Physics Standard 12>Chapter 9 - Current Electricity>Exercises>Q 2

In Wheatstone's meter-bridge experiment the null point is obtained in middle one third portion of wire.

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12th Maharashtra Board

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Physics Standard 12>Chapter 9 - Current Electricity>Exercises>Q 2

State any two sources of errors in meter-bridge experiment. Explain how they can be minimized.