Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 11

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Question 1
1 / -0

A wire is perpendicular to the plane of the paper. A ring of compass needles surrounds the wire in the plane of the paper with center of ring being the center of the wire .Initially there is no current in the wire. What happens after a steady dc current is established in the wire?

A
The needles become parallel to each other

B
Nothing happens

C
The needles become tangential to the ring of which they are a part

D
Some needles become parallel to each other while others are uneffected

Solution

The current carrying wire has a magnetic field around it and the lines of force are in the form of concentric circles with their centers on the wire. Magnetic force acts along the tangent to the circle i.e. along the direction of magnetic field.
Question 2
1 / -0

A wire of length L carrying current i is placed perpendicular to the magnetic induction B. The total force on the wire is

A
iL/B

B
iB/L

C
LB/i

D
iLB

Solution

Magnitude of the Force experienced by a current carrying conductor placed in a magnetic field is ILB sin θ. If the angle between the directions of the current and the magnetic field is 90⁰, F= iLB
Question 3
1 / -0

A magnet is placed with its north pole towards north of the earth. Predict the position of the neutral point.

A
From weaker to stronger parts.

B
From stronger to weaker parts.

C
Perpendicular to the field.

D
Equal to the field.