Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 43

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A combination of five resistors are connected with a cell of emf $10 V$ as shown in figure. The potential difference $V_{B} - V_{E}$ will be

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Important Questions on Current Electricity

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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 44

In the meter bridge shown below, the resistance $X$ has a negative temperature coefficient of resistance. Neglecting the variation in other resistors, when current is passed for some time in the circuit, balance point should shift towards

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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 45

A galvanometer of resistance

100 Ω

gives full scale deflection at

10 mA

current. What should be the value of shunt so that it can measure a current of

100 mA ?

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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 46

Two cells of emf

E_{1}

and

E_{2}

are joined in series and the balancing length of the potentiometer wire is

625 cm .

If the terminals of

E_{1}

are reversed, the balancing length obtained is

125 cm .

Given

E_{2} > E_{1},

the ratio

E_{1} : E_{2}

will be

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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 47

A

10 m

long potentiometer wire is connected to a battery having a steady voltage. A Leclanche cell is balanced at

4 m

of the wire. If the length is kept the same but its cross-section is doubled, the null point will be obtained at

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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 48

Out of the two bulbs in a household circuit, one bulb glows brighter than the other, Which of the two bulbs has a large resistance?

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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 49

Two electric bulbs whose resistance are in the ratio

1 : 2

are connected in parallel to a constant voltage source. The power dissipated in them will have the ratio

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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 50

How many

60 W

bulbs may be safely run on

220 V

using a

5 A

fuse?

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Gamma Question Bank for Medical Physics>Chapter 18 - Current Electricity>Assignment>Q 51

Three identical bulbs $B_{1}, B_{2}$ and $B_{3}$ are connected to the mains as shown in figure. If $B_{3}$ is disconnected from the circuit by opening switch $S,$ then incandescence of bulb $B_{1}$ will