Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 11

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Weekly Quiz Competition

Question 1
4 / -1

Three long straight wires A, B and C are carrying currents as shown in fig. The resultant force on B is directed

A
perpendicular to the plane of paper and outwards

B
perpendicular to the plane of paper and inwards

C
towards A

D
towards C

Solution
Question 2
4 / -1

A one mettre long wire is lying at right angles to the magnetic field. A force of 1 kg wt is acting on it in a magnetic field of 0.98 tesla. The current flowing in it will be

A
100 A

B
10 A

C
1 A

D
zero

Solution
Question 3
4 / -1

A galvanometer has 30 divisions and a sensitivity 16 μA/div. it can be converted in to a voltmeter to read 3 V by connecting

A
resistance nearly 6 k Ω in series

B
6 k Ω in parallel

C
500 Ω in series

D
6.6 k Ω in series

Solution
Question 4
4 / -1

A current I ampere flows in the loop having circular arc of radius r subtending an angle θ as shown in fig. the magnetic field at the Centre O of the circle is.

A

B

C

D

Solution
Question 5
4 / -1

A particle with specific charge s is fired with a speed υ towards a wall at a distance d, perpendicular to the wall. What minimum magnetic field must exist in this region for the particle not to hit the wall?

A

B

C

D

Solution
Question 6
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 7
4 / -1

A circular coil of radius R carries an electric current. The magnetic field due to the coil at a point on the axis of the coil located at a distance r from the centre of the coil, such that r >> R, varies as

A

B

C

D

Solution
Question 8
4 / -1

Magnetic effect of current was dicovered by

A
Faraday

B
Oersted

C
Ampere

D
Bohr
Question 9
4 / -1

The direction of magnetic lines of forces close to a straight conductor carrying current will be

A
Along the length of the conductor

B
Radially outward

C
Circular in a plane perpendicular to the conductor

D
Helical

Solution
Question 10
4 / -1

The distance at which the magnetic field on axis as compared to the magnetic field at the centre of the coil carrying current I and radius R is 1/8, would be

A
R

B
√2 R

C
2R

D
√3 R

Solution