Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 3

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Weekly Quiz Competition

Question 1
4 / -1

A length of wire carries a steady current. It is bent first to form a circular coil of one turn. The same length is now bent more sharply to give a double loop of smaller radius. The magnetic field at the centre caused by the same current is

A
double of its first value

B
quarter of its first value

C
four times of its first value

D
same as the first value

Solution
Question 2
4 / -1

A steady electric current is flowing through a cylindrical conductor

A
the magnetic field in the vicinity of the conductor is zero

B
the electric field in the vicinity of the conductor is non-zero

C
the magnetic field at the axis of the conductor is zero

D
the electric field at the axis of the conductor is zero

Solution
Question 3
4 / -1

If two parallel wires carry current in opposite directions

A
the wires attract each other

B
the wires repel each other

C
the wires experience neither attraction nor repulsion

D
the forces of attraction or repulsion do not depend on current direction
Question 4
4 / -1

The magnetic field at the centre of a circular current carrying conductor of radius r is B_c . The magnetic field on its axis at a distance r from the centre is B_a . The value of B_c : B_a will be

A
1 : √2

B
1 : 2√2

C
2√2 : 1

D
√2 : 1

Solution
Question 5
4 / -1

A circular conductor of radius 5 cm produces a magnetic field of 7 × 10^-6 T. The current flowing through the conductor is

A
3.0 A

B
2.25 A

C
4.5 A

D
0.56 A

Solution
Question 6
4 / -1

A current of 10 A is passing through a long wire which has semicircular loop of the radius 20 cm as shown in the figure. Magnetic field produced at the centre of the loop is

A
10 πμ T

B
5 πμ T

C
4 πμ T

D
2 πμ T

Solution
Question 7
4 / -1

A

B
4

C
1

D

Solution
Question 8
4 / -1

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

A
the magnetic field is zero only on the axis of the pipe

B
the magnetic field is different at different points inside the pipe

C
the magnetic field at any point inside the pipe is zero

D
the magnetic field at all points inside the pipe is the same, but not zero
Question 9
4 / -1

A circular coil carrying a certain current produces a magnetic field B₀ at its centre. The coil is now rewound so as to have 3 turns and the same current is passed through it. The new magnetic field at the centre is

A

B
9B₀

C

D
3B₀

Solution
Question 10
4 / -1

An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the lengths and radii of the wires are in the ratio of 4/3 and 2/3, then the ratio of the currents passing through the wire will be

A
3

B
1/3

C
8/9

D
2

Solution