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A wire connected in the left gap of a meter bridge balance a 10 Ω resistance in the right gap at a point, which divides the bridge wire in ratio 3:2. If the length of the wire is 1 m, the length of one ohm wire is

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Important Questions on Current Electricity

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CUET (UG)
IMPORTANT

In a practical Wheatstone bridge circuit as shown, when one more resistance of 100 Ω is connected in parallel with an unknown resistance x, then, the ratio l1l2 becomes 2. If l1 is the balance length and AB is a uniform wire, then the value of x must be 

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In the given figure, the galvanometer shows no deflection. What is the value of R

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The length of the potentiometer wire is 100 cm and resistance is 1 Ω/cm.

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IMPORTANT

In the shown arrangement of the experiment of the metre bridge if AC corresponding to null deflection of galvanometer is x, what would be its value if the radius of the wire AB is doubled?

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CUET (UG)
IMPORTANT
In a metre bridge experiment, null point is obtained at 20 cm from one end of the wire when resistance X is balanced against another resistance Y. If X<Y, then there will be the new position of the null point from the same end, if one decides to balance a resistance of 4X against Y
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IMPORTANT
A potentiometer works on the principle that
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CUET (UG)
IMPORTANT
A potentiometer has an uncertainty of ±0.0001 V. If it is used to measure current through a standard resistance of 0.1±0.001 % Ω (uncertainty). The voltage across the resistance is measured to be 0.2514 V. What is the percentage uncertainty in the measurement of current?
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CUET (UG)
IMPORTANT
In the circuit shown, a four-wire potentiometer is made of a 400 cm long wire, which extends between A and B . The resistance per unit length of the potentiometer wire is r=0.01 Ω/cm. If an ideal voltmeter is connected as shown with jockey J  at 50 cm from end A , the expected reading of the voltmeter will be:
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CUET (UG)
IMPORTANT
A potentiometer is used for the determination of internal resistance of a 1.6 V cell. The balance point of the cell in open circuit is 75.8 cm. When a resistor of 10.2 Ω is used in the external circuit of the balance point shifts to 68.3 cm length of the potentiometer wire. The internal resistance of the cell is
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