Magnetic Effects of Current and Magnetism (NEET Physics): Questions 147 - 150 of 152

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 2099 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 550.00 or

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 –

current flowing conductor PQRST

Current Flowing Conductor PQRST

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.

Choices

Choice (4) Response
a.

μ0i4πr[3π21](k^)

b.

μ0i4πr[3π2+1](k^)

c.

μ0i4πr[3π21]k^

d.

μ0i4πr[3π2+1]k^

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 3.57×102T. If the value of em is 1.76×1011Ckg , the frequency of revolution of the electron is:

Choices

Choice (4) Response
a.

1GHz

b.

62.8MHz

c.

100MHz

d.

6.82MHz

Sign In