Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 29

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Weekly Quiz Competition

Question 1
4 / -1

An arc of a circle of radius R subtends an angle π/2 at the centre. It carries a current i. The magnetic field at the centre will be

A

B

C

D

Solution
Question 2
4 / -1

At a distance of 10 cm from a long straight wire carrying current, the magnetic field is 0.04 T. At the distance of 40 cm, the magnetic field will be

A
0.01 T

B
0.02 T

C
0.08 T

D
0.16 T

Solution
Question 3
4 / -1

The magnetic induction at any point due to a long straight wire carrying a current is

A
Proportional to the distance from the wire

B
Inversely proportional to the distance from wire

C
Inversely proportional to the square of the distance from the wire

D
Does not depend on distance

Solution
Question 4
4 / -1

The expression for magnetic induction inside a solenoid of length L carrying a current I and having N number of turns is

A

B

C

D

Solution
Question 5
4 / -1

In a current carrying long solenoid, the field produced does not depend upon

A
Number of turns per unit length

B
Current flowing

C
Radius of the solenoid

D
All of the above

Solution
Question 6
4 / -1

A conducting rod of 1 m length and 1 kg mass is suspended by two vertical wires through its ends. An external magnetic field of 2T is applied normal to the rod. Now the current to be passed through the rod so as to make the tension in the wires zero is [Take g = 10 ms^–2]

A
0.5 A

B
15 A

C
5 A

D
1.5 A

Solution
Question 7
4 / -1

A circular coil \'A\' has a radius R and the current flowing through it is I. Another circular coil ‘B’ has a radius 2R and if 2I is the current flowing through it, then the magnetic fields at the centre of the circular coil are in the ratio of (i.e., B_A to B_B)

A
4 : 1

B
2 : 1

C
3 : 1

D
1 : 1

Solution
Question 8
4 / -1

A current I flows along the length of an infinitely long, straight and thin-walled pipe. Then

A
The magnetic field at all points inside the pipe is the same but not zero

B
The magnetic field at any point inside the pipe is zero

C
The magnetic field is zero only on the axis of the pipe

D
The magnetic field is different at different points inside the pipe

Solution
Question 9
4 / -1

The magnetic field at the centre of current carrying coil

A

B

C

D

Solution
Question 10
4 / -1

A straight wire of diameter 0.5 mm carrying a current of 1 A is replaced by another wire of 1 mm diameter carrying the same current. The strength of magnetic field far away is

A
Twice the earlier value

B
Half of the earlier value

C
Quarter of its earlier value

D
Unchanged

Solution