# Magnetic Effects of Current and Magnetism (NEET (NTA-National Eligibility cum Medical Entrance Test) Physics): Questions 147 - 150 of 155

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## Question number: 147

» Magnetic Effects of Current and Magnetism » Moving Coil Galvanometer

MCQ▾

### Question

What is the shape of magnet in moving coil galvanometer to make the radial magnetic field?

### Choices

Choice (4) Response

a.

Convex cylindrical

b.

None

c.

Horse shoe magnet

d.

Concave cylindrical

## Question number: 148

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

MCQ▾

### Question

A current of 30 A is flowing in a vertical straight wire. If the horizontal component of earth’s magnetic field is 2 x 10 -5 tesla then the distance of null point from wire is –

### Choices

Choice (4) Response

a.

0.3 m

b.

0.3 cm

c.

0.3 mm

d.

0.9 m

## Question number: 149

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

MCQ▾

### Question

A current i is flowing in a conductor PQRST shaped as shown in the figure. The radius of curved part QRS is r and length of straight portions PQ and ST is very large. The magnetic field at the center O of the curved part is –

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 150

» Magnetic Effects of Current and Magnetism » Electric Charge Moving in Magnetic Field

Appeared in Year: 2016

MCQ▾

### Question

An electron is moving in a circular path under the influence of a transvers magnetic field of If the value of is , the frequency of revolution of the electron is:

### Choices

Choice (4) Response

a.

b.

c.

d.

f Page