Magnetic Effects of Electric Current - Set 1

Question 1

Choose the incorrect statement from the following regarding magnetic field lines.

Accepted Answer

If magnetic field lines are parallel and equidistant, they represent zero field strength.

Answer

The direction of magnetic field at a point is taken to be the direction in which the north pole of a magnetic compass needle points.

Answer

Magnetic field lines are closed curves.

Answer

Relative strength of magnetic field is shown by the degree of closeness of the field lines.

Question 2

Which of the following materials can be used to make permanent magnets?

Accepted Answer

Steel

Answer

Iron

Answer

Cobalt

Answer

Nickel

Question 3

A constant current flows in a horizontal wire in the plane of the paper from east to west as shown in figure. The direction of magnetic field at a point will be North to South

Accepted Answer

directly below the wire

Answer

directly above the wire

Answer

at a point located in the plane of the paper, on the north side of the wire

Answer

at a point located in the plane of the paper, on the south side of the wire

Question 4

Hans Christian Oersted discovered that

Accepted Answer

electric current in a wire shows magnetic effects.

Answer

electricity can flow through a compass needle.

Answer

magnetic compass can make electricity flow in a wire.

Answer

electricity and magnetism are separate phenomena and do not affect each other.

Question 5

If the key in the arrangement shown below is taken out (the circuit is made open) and magnetic field lines are drawn over the horizontal plane ABCD, the lines are

Accepted Answer

straight lines parallel to each other

Answer

concentric circles

Answer

elliptical in shape

Answer

concentric circles near the point O but of elliptical shapes as we go away from it

Question 6

In an overhead straight wire, the current is towards north. The magnetic field due to this current, at our point of observation, is towards

Accepted Answer

west

Answer

east

Answer

north

Answer

down

Question 7

A circular loop placed in a plane perpendicular to the plane of paper, carries a current when the key is ON. The current as seen from points A and B (in the plane of paper and on the axis of the coil) is anticlockwise and clockwise respectively. The magnetic field lines point from B to A. The N-pole of the resultant magnet is on the face close to

Accepted Answer

A

Answer

B

Answer

A if the current is small, and B if the current is large

Answer

B if the current is small and A if the current is large

Question 8

An iron bar is attracted towards a magnet. This indicates that the iron bar

Accepted Answer

may or may not be magnetised

Answer

is charged

Answer

is magnetised

Answer

is unmagnetised

Question 9

Electrons are going around a circle in an anticlockwise direction as shown. At the center of the circle, they produce a magnetic field that is

Accepted Answer

into the page

Answer

out of the page

Answer

to the left

Answer

to the right

Question 10

Magnetic induction does not involve

Accepted Answer

touching a magnetic material with a magnet.

Answer

placing a magnetic material near a magnet.

Answer

induction of opposite pole on the nearer side of magnetic material facing the magnet.

Answer

induction of similar pole on the farther side of magnetic material away from the magnet.

Magnetic Effects of Electric Current - Set 1

Magnetic Effects of Electric Current - Set 1

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