Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 26

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Weekly Quiz Competition

Question 1
4 / -1

An infinitely long straight conductor is bent into the shape as shown in the figure. It carries a current of i ampere and the radius of the circular loop is r metre. Then the magnetic induction at its centre will be

A

B

C
Zero

D
Infinite

Solution
Question 2
4 / -1

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

A

B

C

D

Solution
Question 3
4 / -1

A horizontal overhead power line is at a height of 4m from the ground and carries a current of 100A from east to west. The magnetic field directly below it on the ground is (μ₀ = 4π × 10^–7 TmA^–1)

A
5 × 10^–6 T Northward

B
5 × 10^–6 T Southward

C
2.5 × 10^–7 T Northward

D
2.5 × 10^–7 T Southward

Solution
Question 4
4 / -1

A
Proportional to a

B
Proportional to a²

C
Proportional to 1/a

D
Zero

Solution
Question 5
4 / -1

A helium nucleus makes a full rotation in a circle of radius 0.8 metre in two seconds. The value of the magnetic field B at the centre of the circle will be

A

B

C

D

Solution
Question 6
4 / -1

Consider two straight parallel conductors A and B separated by distance x and carrying individual currents i_A and i_B respectively. If the two conductors attract each other, it indicates that

A
The two currents are parallel in direction

B
The two currents are antiparallel in direction

C
The magnetic lines of induction are parallel

D
The magnetic lines of induction are parallel to length of conductors
Question 7
4 / -1

The strength of the magnetic field at a point r near a long straight current carrying wire is B. The field at a distance r/2 will be

A

B

C
2B

D
4B

Solution
Question 8
4 / -1

Field at the centre of a circular coil of radius r, through which a current I flows is

A
Directly proportional to r

B
Inversely proportional to I

C
Directly proportional to I

D
Directly proportional to 1²

Solution
Question 9
4 / -1

Current ‘I’ is flowing in a conductor shaped as shown in the figure. The radius of the curved part is r and the length of straight portion is very large. The value of the magnetic field at the centre O will be

A

B

C

D

Solution
Question 10
4 / -1

The magnetic field B with in the solenoid having n turns per metre length and carrying a current of i ampere is given by

A

B

C

D

Solution