Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 32

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Weekly Quiz Competition

Question 1
4 / -1

An electron moving in a circular orbit of radius r makes n rotations per second. The magnetic field produced at the centre has a magnitude of

A

B

C

D
Zero

Solution
Question 2
4 / -1

A wire carrying current i is shaped as shown. Section AB is a quarter circle of radius r. The magnetic field is directed

A
At an angle π/4 to the plane of the paper

B
Perpendicular to the plane of the paper and directed in to the paper

C
Along the bisector of the angle ACB towards AB

D
Along the bisector of the angle ACB away from AB
Question 3
4 / -1

Two long straight wires are set parallel to each other. Each carries a current i in the same direction and the separation between them is 2r. The intensity of the magnetic field midway between them is

A

B

C
Zero

D

Solution
Question 4
4 / -1

A magnetic field can be produced by

A
A moving charge

B
A changing electric field

C
None of these

D
Both of these
Question 5
4 / -1

For the magnetic field to be maximum due to a small element of current carrying conductor at a point, the angle between the element and the line joining the element to the given point must be

A
0°

B
90°

C
180°

D
45°

Solution
Question 6
4 / -1

Gauss is unit of which quantity

A
H

B
B

C
Φ

D
I
Question 7
4 / -1

On connecting a battery to the two corners of a diagonal of a square conductor frame of side a, the magnitude of the magnetic field at the centre will be

A
Zero

B

C

D
Question 8
4 / -1

The ratio of the magnetic field at the centre of a current carrying coil of the radius a and at a distance \'a\' from centre of the coil and perpendicular to the axis of coil is

A

B

C

D

Solution
Question 9
4 / -1

A part of a long wire carrying a current i is bent into a circle of radius r as shown in figure. The net magnetic field at the centre Oof the circular loop is

A

B

C

D

Solution
Question 10
4 / -1

\"On flowing current in a conducting wire the magnetic field produces around it.\" It is a law of

A
Lenz

B
Ampere

C
Ohm

D
Maxwell