Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 15

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Weekly Quiz Competition

Question 1
4 / -1

A steady current flows in a long wire. It is bent into a circular loop of one turn and the magnetic field at the centre of the coil is B. If the same wire is bent into a circular loop of n turns, the magnetic field at the centre of the coil is

A

B

C

D

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
perpendicular to the plane of the paper and directed into the paper

B
an angle π/4 to the plane of the paper

C
along the bisector of the angle ACB away from AB

D
along the bisector of ACB towards AB

Solution
Question 3
4 / -1

A steady current I flows along an infinitely long hollow cylindrical conductor of radius R. This cylinder is placed coaxially inside an infinite solenoid of radius 2R. The solenoid has n turns per unit length and carries a steady current I. Consider a point P at a distance r from the common axis. The correct statement (s) is (are)

A
In the region 0 < r < R, the magnetic field is non-zero

B
In the region R < r < 2R, the magnetic field is along the common axis

C
In the region R < r < 2R, the magnetic field is tangential to the circle of radius r, centered on the axis

D
In the region r > 2R, the magnetic field is non-zero

Solution
Question 4
4 / -1

A current I flow in an infinitely long wire cross-section in the form of a semi-circular ring of radius R. The magnitude of the magnetic induction along its axis is

A

B

C

D

Solution
Question 5
4 / -1

A current of i ampere flows in a circular area of wire which subtends an angle of (3π/ 2) radian at its centre, whose radius is R. The magnetic induction B at the centre is

A
μ₀i/R

B
μ₀i/2R

C
2μ₀i/R

D
3μ₀i/8R

Solution
Question 6
4 / -1

The magnetic field on the axis of a long solenoid having n turns per unit length and carrying a current i is

A
μ₀ n i

B
μ₀ n² i

C
μ₀ n i²

D
None of these

Solution
Question 7
4 / -1

A current i is passing through a straight conductor of infinite length. The magnetic field at a point situated at a distance R from the conductor is

A

B

C

D

Solution
Question 8
4 / -1

A current i is flowing through the loop. The direction of the current and the shape of the loop are as shown in the figure.

A

B

C

D

Solution
Question 9
4 / -1

PQ and RS are long parallel conductors separated by certain distance. M is the mid-point between them (see the figure). The net magnetic field at M is B. Now, the current 2 A is switched off. The field at M now becomes

A
2B

B
B

C

D
3B

Solution
Question 10
4 / -1

Magnetic field at the centre of a circular coil of radius R due to i flowing through it is B. The magnetic field at a point along the axis at distance R from the centre is

A

B

C

D

Solution