# Magnetic Effects of Current and Magnetism (NEET Physics): Questions 122 - 127 of 155

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## Question number: 122

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

MCQ▾

### Question

A circular arc of wire of radius of curvature r subtends an angle of radian at its center. If current i is flowing in it then the magnetic induction at its center is –

### Choices

Choice (4) Response

a.

b.

c.

d.

0

## Question number: 123

» Magnetic Effects of Current and Magnetism » Ampere's Law

MCQ▾

### Question

A 6.28m long wire is turned into a coil of diameter 0.2m and a current of 1 amp is passed in it. The magnetic induction at its center will be –

### Choices

Choice (4) Response

a.

6.28 T

b.

6.28 x 10 -5 T

c.

0 T

d.

6.28 x 10 -3 T

## Passage

A wire carrying a 10 A current is bent to pass through sides of a cube of side 10 cm as shown in figure. A magnetic field T is present in the region. Then, find

## Question number: 124 (1 of 3 Based on Passage) Show Passage

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

MCQ▾

### Question

The net force on the loop

### Choices

Choice (4) Response

a.

F net = 0

b.

F net = (0.36k) N

c.

F net = (0.3i + 0.4k) N

d.

F net = (0.1i-0.2k) N

## Question number: 125 (2 of 3 Based on Passage) Show Passage

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

MCQ▾

### Question

The net torque on the loop is,

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 126 (3 of 3 Based on Passage) Show Passage

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

MCQ▾

### Question

The magnetic moment vector of the loop.

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 127

» Magnetic Effects of Current and Magnetism » Bar Magnet

MCQ▾

### Question

A 10 cm long bar magnet of magnetic moment 1.34 Am 2 is placed in the magnetic meridian with its south pole pointing geographical south. The neutral point is obtained at a distance of 15 cm from the center of the magnet. Calculate the horizontal component of earth’s magnetic field.

### Choices

Choice (4) Response

a.

0.21 x 10 -4 T

b.

0.12 x 10 -4 T

c.

0.87 x 10 -7 T

d.

0.34 x 10 -4 T

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