For the network shown in the figure, the value of from Class Physics Current Electricity

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NEET Physics : Current Electricity

Multiple Choice Questions

51.

A uniform wire of length I and having resistance R is cut into n equal parts and all parts are connected in parallel, then the equivalent resistance will be :

  • R

  • R/n

  • R/n2

  • n2R



52.

For the network shown in the figure, the value of the current i is

  • 9 V35

  • 5 V18

  • 5 V9

  • 18 V5



53.

When a wire of uniform cross-section a, length land resistance R is bent into a complete circle, resistance between two of dimetrically opposite points will be

  • R4

  • R8

  • 4R

  • R2



54.

The resistance of an ammeter is 13 Ω and its scale is graduated for a current upto 100 A. After an additional shunt has been connected to this ammeter it becomes possible to measure currents upto 750 A by this meter. The value of
shunt resistance is

  • 20 Ω

  • 2 Ω

  • 0.2 Ω

  • 2 KΩ



55.

Three resistances P, Q, R each of 2Ω and an unknown resistance S form the four arms of a Wheatstone's bridge circuit. When a resistance of 6Ω is connected in parallel to S the bridge gets balanced. What is the value of S?

  • 2 Ω

  • 3 Ω

  • 6 Ω

  • 1 Ω



56.

For a metallic wire, the ratio Vi ( V = applied potential difference and i = current flowing) is

  • independent of temperature

  • increases as the temperature rises

  • decreases as the temperature rises

  • increases or decreases as temperature rises depending upon the metal 



57.

A galvanometer having a resistance of 8 Ω is shunted by a wire of resistance 2 Ω.1f the total current is 1 A, the part of it passing through the shunt will be

  • 0.25 A

  • 0.8 A

  • 0.2 A

  • 0.5 A



58.

At room temperature, copper has free electron density of 8.4 x 1028 m-3,  The electron drift velocity in a copper conductor of cross-section area of 10-6 m2 and carrying a current of 5.4 A will be

  • 4 ms-1

  • 0.4 ms-1

  • 4 ms-1

  • 0.4 mm s-1



59.

A uniform wire of resistance R and length L is cut into four equal parts, each of length L/4, which are then connected in parallel combination. The effective resistance of the combination will be

  • R

  • 4 R

  • R4

  • R16



60.

A capacitor of capacitance 5µF is connected as shown in the figure. The internal resistance of the cell is 0.5 Ω . The amount of charge on the capacitor plates is  

             

  • 80 μC

  • 40 μC

  • 20 μC

  • 10 μC



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