JEE Main 2018 (Offline) | Current Electricity Question 267 | Physics

On interchanging the resistances, the balance point of a meter bridge shifts to the left by 10 cm. The resistance of their series combination is 1 k$$\Omega $$. How much was the resistance on the left slot before interchanging the resistances?

910 $$\Omega $$

990 $$\Omega $$

505 $$\Omega $$

550 $$\Omega $$

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MCQ (Single Correct Answer)

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Out of Syllabus

In a potentiometer experiment, it is found that no current passes through the galvanometer when the terminals of the cell are connected across 52 cm of the potentiometer wire. If the cell is shunted by a resistance of 5 $$\Omega$$, a balance is found when the cell is connected across 40 cm of the wire. Find the internal resistance of the cell.

2.5 $$\Omega$$

1 $$\Omega$$

1.5 $$\Omega$$

2 $$\Omega$$

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MCQ (Single Correct Answer)

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A copper rod of cross-sectional area A carries a uniform current I through it. At temperature T, if the volume charge density of the rod is $$\rho $$, how long will the changes take to travel a distance d ?

$${{2\rho \,d\,A} \over {\rm I}}$$

$${{2\rho \,d\,A} \over {{\rm I}\,T}}$$

$${{\rho \,d\,A} \over {{\rm I}\,}}$$

$${{\rho \,d\,A} \over {{\rm I}\,T}}$$

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MCQ (Single Correct Answer)

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A constant voltages is applied between two ends of a metallic wire. If the length is halved and the radius of the wire is doubled, the rate of heat developed in the wire will be :

Doubled

Halved

Unchanged

Increased 8 times

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