Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 27

Score
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Weekly Quiz Competition

Question 1
4 / -1

The magnetic induction at the centre 0 in the figure shown is

A

B

C

D

Solution
Question 2
4 / -1

Field inside a solenoid is

A
Directly proportional to its length

B
Directly proportional to current

C
Inversely proportional to total number of turns

D
Inversely proportional to current

Solution
Question 3
4 / -1

In the above question, the magnetic induction at O due to the whole length of the conductor is

A

B

C

D
Zero

Solution
Question 4
4 / -1

In the figure shown there are two semicircles of radii r₁ and r₂ in which a current i is flowing. The magnetic induction at the centre Owill be

A

B

C

D

Solution
Question 5
4 / -1

A wire of length l is bent into a circular loop of radius R and carries a current I. The magnetic field at the centre of the loop is B. The same wire is now bent into a double loop of equal radii. If both loops carry the same current I and it is in the same direction, the magnetic field at the centre of the double loop will be

A
Zero

B
2 B

C
4 B

D
8 B

Solution
Question 6
4 / -1

A particle carrying a charge equal to 100 times the charge on an electron is rotating per second in a circular path of radius 0.8 metre. The value of the magnetic field produced at the centre will be (μ₀ = permeability for vacuum)

A

B

C

D

Solution
Question 7
4 / -1

In hydrogen atom, an electron is revolving in the orbit of radius 0.53 Å with 6.6 × 10¹⁵ rotations/second. Magnetic field produced at the centre of the orbit is

A
0.125 wb/m²

B
1.25 wb/m²

C
12.5 wb/m²

D
125 wb/m²

Solution
Question 8
4 / -1

Magnetic effect of current was discovered by

A
Faraday

B
Oersted

C
Ampere

D
Bohr
Question 9
4 / -1

A long solenoid has a radius a and number of turns per unit length n. If it carries a current i, then the magnetic field on its axis is directly proportional to

A
ani

B
ni

C
ni/a

D
n² i

Solution
Question 10
4 / -1

A cell is connected between two points of a uniformly thick circular conductor. The magnetic field at the centre of the loop will be
(Here i₁ and i₂ are the currents flowing in the two parts of the circular conductor of radius \'a\' and μ₀ has the usual meaning)

A
Zero

B

C

D