# Magnetic Effects of Current and Magnetism (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 44 - 49 of 155

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## Passage

Read the passage given below and answer the questions that follow:

A conducting wire is bent into a loop as shown in the figure. The segment AOB is parabolic given by the equation y 2 = 2x while segment BA is a straight line parallel to the y-axis.

The magnetic field in the region is B and the current in the wire is 2A.

## Question number: 44 (1 of 3 Based on Passage) Show Passage

» Magnetic Effects of Current and Magnetism » Biot - Savart Law

MCQ▾

### Question

Magnetic field at point D due to segment AO of the loop is directed parallel to

### Choices

Choice (4) Response

a.

k

b.

j

c.

i

d.

-k

## Question number: 45 (2 of 3 Based on Passage) Show Passage

» Magnetic Effects of Current and Magnetism » Current Loop as Magnetic Dipole

MCQ▾

### Question

The torque on the loop will be

### Choices

Choice (4) Response

a.

b.

c.

16 Nm

d.

Zero

## Question number: 46 (3 of 3 Based on Passage) Show Passage

» Magnetic Effects of Current and Magnetism » Biot - Savart Law

MCQ▾

### Question

The field created by the current in the loop at point C will be

### Choices

Choice (4) Response

a.

b.

c.

d.

None of the above

## Question number: 47

» Magnetic Effects of Current and Magnetism » Moving Coil Galvanometer

MCQ▾

### Question

The deflection in a moving coil galvanometer is

### Choices

Choice (4) Response

a.

Inversely proportional to the area of the coil

b.

Directly proportional to the number of turns in the coil

c.

Directly proportional to the torsional constant

d.

Inversely proportional to the current flowing

## Question number: 48

» Magnetic Effects of Current and Magnetism » Biot - Savart Law

MCQ▾

### Question

The magnitude of magnetic field at a point having perpendicular distance 50 mm from a long straight conducting wire carrying a current of 3A is, ()

### Choices

Choice (4) Response

a.

0.12 G

b.

1.2 G

c.

0.012 G

d.

12 G

## Question number: 49

» Magnetic Effects of Current and Magnetism » Earth's Magnetic Field

Assertion-Reason▾

### Assertion (Ꭺ)

A compass needle when placed on the magnetic north pole of the earth cannot rotate in vertical direction.

### Reason (Ꭱ)

The earth has only horizontal component of its magnetic field at the north poles.

### Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

c.

Ꭺ is true but Ꭱ is false

d.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

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