Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 61

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

A
F_m = 1.2 N along +ve x–direction

B
F_m = 1.2 N along –ve x–direction

C
F_m = 1.2 N along +ve y–direction

D
F_m = 1.2 N along –ve y–direction

Solution
Question 2
4 / -1

Five very long straight wires are bound together to form a small cable currents carried by the wires are I₁ = 20 A, I₂ = –6 A, I₃ = 12 A, I₄ = –7 A, I₅ = 18 A. The magnetic induction at a distance of 10 cm from the cable is

A
34 μT

B
74 mT

C
34 mT

D
74μT

Solution
Question 3
4 / -1

Following figure shows the path of an electron that passes through two regions containing uniform magnetic fields of magnitudes B₁ and B₂. It\'spath in each region is a half circle, choose the correct option

A
B₁ is into the page and it is stronger than B₂

B
B₁ is into the page and it is weaker than B₂

C
B₁ is out of the page and it is weaker than B₂

D
B₁ is out of the page and it is stronger than B₂

Solution
Question 4
4 / -1

The square loop ABCD, carrying a current i, is placed in uniform magnetic field B, as shown. The loop can rotate about the axis XX\'. The plane of the loop makes an angle θ (θ < 90°) with the direction of B. Through what angle will the loop rotate by itself before the torque on it becomes zero

A
θ

B
90°– θ

C
90°+ θ

D
180° – θ

Solution
Question 5
4 / -1

A cylindrical conductor of radius \'R\' carries a current \'i\'. The value of magnetic field at a point which is R/4distance inside from the surface is 10 T. Find the value of magnetic field at point which is 4R distance outside from the surface

A

B

C

D

Solution
Question 6
4 / -1

Three long straight wires are connected parallel to each other across a battery of negligible internal resistance. The ratio of their resistances are 3 : 4 : 5. What is the ratio of distances of middle wire from the others if the net force experienced by it is zero

A
4 : 3

B
3 : 1

C
5 : 3

D
2 : 3

Solution
Question 7
4 / -1

A horizontal metal wire is carrying an electric current from the north to the south. Using a uniform magnetic field, it is to be prevented from failing under gravity. The direction of this magnetic field should be towards the

A
North

B
South

C
East

D
West
Question 8
4 / -1

A length L of wire carries a steady current I. It is bent first to form a circular plane 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
A quarter of its first value

B
Unaltered

C
Four times of its first value

D
A half of its first value

Solution
Question 9
4 / -1

A vertical straight conductor carries a current vertically upwards. A point P lies to the east of it at a small distance and another point Q lies to the west at the same distance. The magnetic field at P is

A
Greater than at Q

B
Same as at Q

C
Less than at Q

D
Greater or less than at Q depending upon the strength of the current

Solution
Question 10
4 / -1

If a copper rod carries a direct current, the magnetic field associated with the current will be

A
Only inside the rod

B
Only outside the rod

C
Both inside and outside the rod

D
Neither inside nor outside the rod