# Experimental Skills (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 38 - 42 of 67

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## Passage

Consider a block of conducting material of resistivity ′ ρ ′ shown in the figure. Current I enter at ‘A’ and leaves from ‘D’. We apply superposition principle to find voltage ∆ V’ developed between ‘B’ and ‘C’. The calculation is done in the following steps:

(i) Take current T entering from ‘A’ and assume it to spread over a hemispherical surface in the block

(ii) Calculate field E (r) at distance ‘r’ from A by using Ohm’s law E = ρ j, where j is the current per unit area at ‘r’.

(iii) From the V dependence of E (r), obtain the potential V (r) at r.

(iv) Repeat (i), (ii) and (iii) for current

## Question number: 38 (1 of 2 Based on Passage) Show Passage

» Experimental Skills » Resistivity of the Material

MCQ▾

### Question

For current entering at A, the electric field at a distance ‘r’ from A is

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 39 (2 of 2 Based on Passage) Show Passage

» Experimental Skills » Resistivity of the Material

MCQ▾

### Question

∆V measured between B and C is,

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 40

» Experimental Skills » Potentiometer

MCQ▾

### Question

Which device is used to measure the potential difference between two points of a conductor in the laboratory?

### Choices

Choice (4) Response

a.

Potentiometer

b.

Voltmeter

c.

Ammeter

d.

Galvanometer

## Question number: 41

» Experimental Skills » Ohm's Law

MCQ▾

### Question

Which two circuit components are connected in parallel in the following circuit diagram?

### Choices

Choice (4) Response

a.

Ammeter and resistor

b.

Voltmeter and ammeter

c.

Rheostat and voltmeter

d.

Voltmeter and resistor

## Question number: 42

» Experimental Skills » Multimeter

MCQ▾

### Question

In the circuit shown, voltmeter is ideal and its least count is 0.1 V. The least count of ammeter is 1 mA. Let reading of the voltmeter is 30.0 V and the reading of ammeter is 0.020 A. Calculate the value of resistance R within error limits.

### Choices

Choice (4) Response

a.

b.

c.

d.

f Page