Hi friends, these are some of the multiple choice questions on electrical and magnetic properties. These are some of the basic questions which are asked in previous competitive papers check out and comment...
1) When the ferromagnetic substance is i nserted in a current- carrying solenoid, the magnetic field is
A) Greatly decreased
B) Greatly increased
C) Slightly decreased
D) Slightly increased
Ans:B
2) The magnetic field of a bar magnet most closely resembles the magnetic field of
A) a horseshoe magnet
B) a straight current- carrying Wire
C) a stream of electrons moving parallel to one another
D) a current- carrying Wire loop
Ans:D
3) The magnetic field of a magnetized iron bar when strongly heated
A) Becomes weaker
B) Becomes stronger
C) Reverses in direction
D) is unchanged
Ans:A
4) A permanent magnet does not exert a force on
A) an unmagnetized iron bar
B) a magnetized iron bar
C) a moving electric charge
D) a stationary electric charge
Ans:D
5) A current if flowing east along a power line. If the earth’s field is neglected, the direction of the magnetic field below it is
A) North
B) South
C) East
D) West
Ans:A
6) The emf produced in a wire by its motion across a magnetic field does not depend upon the
A) Diameter of the wire
B) Length of the wire
C) Orientation of the wire
D) Flux density of the field
Ans:A
7) The induced emf in a wire loop that is moved parallel to a uniform magnetic field is
A) Zero
B) Dependent on the area of the loop
C) Dependent on the shape of the loop
D) Dependent on the magnitude of the field
Ans:A
8) When a wire loop is rotated in a magnetic field the direction of the induced emf changes one in every revolution
A) 1/3
B) 1/2
C) 1/4
D. 2/3
Ans:B
9) The magnetic flux through a wire loop in a magnetic field does not depend on
A) The area of the loop
B) The magnitude of the field
C) The shape of the loop
D) The angle between the plane of the loop and the direction
Ans:C
A) Greatly decreased
B) Greatly increased
C) Slightly decreased
D) Slightly increased
Ans:B
2) The magnetic field of a bar magnet most closely resembles the magnetic field of
A) a horseshoe magnet
B) a straight current- carrying Wire
C) a stream of electrons moving parallel to one another
D) a current- carrying Wire loop
Ans:D
3) The magnetic field of a magnetized iron bar when strongly heated
A) Becomes weaker
B) Becomes stronger
C) Reverses in direction
D) is unchanged
Ans:A
4) A permanent magnet does not exert a force on
A) an unmagnetized iron bar
B) a magnetized iron bar
C) a moving electric charge
D) a stationary electric charge
Ans:D
5) A current if flowing east along a power line. If the earth’s field is neglected, the direction of the magnetic field below it is
A) North
B) South
C) East
D) West
Ans:A
6) The emf produced in a wire by its motion across a magnetic field does not depend upon the
A) Diameter of the wire
B) Length of the wire
C) Orientation of the wire
D) Flux density of the field
Ans:A
7) The induced emf in a wire loop that is moved parallel to a uniform magnetic field is
A) Zero
B) Dependent on the area of the loop
C) Dependent on the shape of the loop
D) Dependent on the magnitude of the field
Ans:A
8) When a wire loop is rotated in a magnetic field the direction of the induced emf changes one in every revolution
A) 1/3
B) 1/2
C) 1/4
D. 2/3
Ans:B
9) The magnetic flux through a wire loop in a magnetic field does not depend on
A) The area of the loop
B) The magnitude of the field
C) The shape of the loop
D) The angle between the plane of the loop and the direction
Ans:C
10) Steel is hard to magnetize because of its
A) Low permeability
B) High permeability
C) High density
D) High retentivity
Ans:A
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