# Current Electricity-Potentiometer (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 10 - 14 of 17

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## Question number: 10

» Current Electricity » Potentiometer

MCQ▾

### Question

The resistance of a 10 meter long potentiometer wire is 1 ohm/meter. A cell of emf 2.2 volts and a high resistance box are connected in series with this wire. The value of resistance taken from resistance box for getting potential gradient of 2.2 millivolt/meter will be

### Choices

Choice (4) Response

a.

790 Ω

b.

990 Ω

c.

810 Ω

d.

1000 Ω

## Passage

A 6V battery of negligible internal resistance is connected across a uniform wire AB of length 100cm. The positive terminal of another battery of emf 4V and internal resistance 1Q is joined to the point A as shown in figure. Take the potential at D to be zero.

## Question number: 11 (1 of 2 Based on Passage) Show Passage

» Current Electricity » Potentiometer

MCQ▾

### Question

What is the potential at points A and C?

### Choices

Choice (4) Response

a.

8V, 4V

b.

8V, 3V

c.

6V, 4V

d.

6V, 2V

## Question number: 12 (2 of 2 Based on Passage) Show Passage

» Current Electricity » Potentiometer

MCQ▾

### Question

If the points C and D are connected by a wire, what will be the current through it?

### Choices

Choice (4) Response

a.

2A

b.

3A

c.

1A

d.

Zero

## Question number: 13

» Current Electricity » Potentiometer

MCQ▾

### Question

In given figure, the potentiometer wire AB has a resistance of 5 Ω and length 10 m. What is the balancing length AM for the emf of 0.4 V?

### Choices

Choice (4) Response

a.

4 m

b.

0.4 m

c.

8 m

d.

0.8 m

## Question number: 14

» Current Electricity » Potentiometer

MCQ▾

### Question

A potentiometer has uniform potential gradient. The specific resistance of the material of the potentiometer wire is 10 -7 ohm-meter and the current passing through it is 0.1 ampere; cross-section of the wire is 10 -6 m 2. The potential gradient along the potentiometer wire is

### Choices

Choice (4) Response

a.

10 -8 V/m

b.

10 -2 V/m

c.

10 -4 V/m

d.

10 -6 V/m

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