Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 60

Score
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Rank
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Weekly Quiz Competition

Question 1
4 / -1

Figure shows a straight wire of length lcarrying i. The magnitude of magnetic field produced by the current at point P is

A

B

C

D

Solution
Question 2
4 / -1

A winding wire which is used to frame a solenoid can bear a maximum 10 A current. If length of solenoid is 80 cm and it\'s cross sectional radius is 3 cm, then required length if winding wire is (B = 0.2 T)

A
1.2 × 10² m

B
4.8 × 10² m

C
2.4 × 10³ m

D
6 × 10³ m

Solution
Question 3
4 / -1

A current carrying wire LNis bent in the from shown below. If wire carries a current of 10 A and it is placed in a magnetic field of 5 T which acts perpendicular to the paper outwards then it will experience a force

A
Zero

B
5 N

C
30 N

D
20 N

Solution
Question 4
4 / -1

A wire of length L is bent in the form of a circular coil and current i is passed through it. If this coil is placed in a magnetic field then the torque acting on the coil will be maximum when the number of turns is

A
As large as possible

B
Any number

C
2

D
1

Solution
Question 5
4 / -1

A particle having a charge of 10.0 μC and mass 1 μg moves in a circle of radius 10 cm under the influence of a magnetic field of induction 0.1T. When the particle is at a point P, a uniform electric field is switched on so that the particle starts moving along the tangent with a uniform velocity. The electric field is

A
0.1 V/m

B
1.0 V/m

C
10.0 V/m

D
100 V/m

Solution
Question 6
4 / -1

A
3 : 4

B
11 : 7

C
7 : 11

D
5 : 3

Solution
Question 7
4 / -1

Two circular coils X and Y, having equal number of turns, carry equal currents in the same sense and subtend same solid angle at point O. If the smaller coil X is midway between O and Y, and if we represent the magnetic induction due to bigger coil Y at O as B_Y and that due to smaller coil X at Oas B_X, then

A

B

C

D

Solution
Question 8
4 / -1

A fixed horizontal wire carries a current of 200 A. Another wire having a mass per unit length 10^–2 kg/m is placed below the first wire at a distance of 2 cm and parallel to it. How much current must be passed through the second wire if it floats in air without any support? What should be the direction of current in it?

A
25 A (direction of current is same to first wire)

B
25 A (direction of current is opposite to first wire)

C
49 A (direction of current is same to first wire)

D
49 A (direction of current is opposite to first wire)

Solution
Question 9
4 / -1

Find magnetic field at O

A

B

C

D
Zero

Solution
Question 10
4 / -1

A square loop of side \'a\' hangs from an insulating hanger of spring balance. The magnetic field of strength B occurs only at the lower edge. It carries a current I. Find the change in the reading of the spring balance if the direction of current is reversed

A

B

C

D

Solution