Engineering Entrance Sample Papers

Magnetic Effect of Current Important Questions

magnetic effect of current and magnetism

Magnetic effect of current and Magnetism objective type questions with answers.

Magnetic Effect of Current and Magnetism (Physics)

Question 1
If a long hollow copper pipe carries a direct current, the magnetic field associated with the current will be
A
Only inside the pipe
B
Only outside the pipe
C
Both inside and outside the pipe
D
Neither inside nor outside the pipe
Question 2
A charged particle moving in a magnetic field experiences a resultant force
A
In the direction of field
B
In the direction opposite to that field
C
None of these
D
In the direction perpendicular to both the field and its velocity
Question 3
An electron moving towards the east enters a magnetic field directed towards the north. The force on the electron will be directed
A
Vertically downward
B
Towards the south
C
Towards the west
D
Vertically upward
Question 4
A beam of electrons and protons move parallel to each other in the same direction, then they
A
Repel each other
B
No relation
C
Neither attract nor repel
D
Attract each other
Question 5
An electron moving with a uniform velocity along the positive x-direction enters a magnetic field directed along the positive y-direction. The force on the electron is directed along
A
Positive y-direction
B
Negative z-direction
C
Positive z-direction
D
Negative y-direction
Question 6
A moving coil sensitive galvanometer gives at once much more deflection. To control its speed of deflection
A
A magnet should be placed near the coil
B
A high resistance is to be connected across its terminals
C
The body of galvanometer should be earthed
D
A small copper wire should be connected across its terminals
Question 7
One proton beam enters a magnetic field of 10–4T normally, Specific charge = 1011 C/kg velocity = 107 m/s. What is the radius of the circle described by it

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A
10 m
B
None of these
C
0.1 m
D
1 m
Question 8
A charge + Q is moving upwards vertically. It enters a magnetic field directed to the north. The force on the charge will be towards
A
East
B
South
C
North
D
West
Question 9
A stream of electrons is projected horizontally to the right. A straight conductor carrying a current is supported parallel to electron stream and above it. If the current in the conductor is from left to right then what will be the effect on electron stream
A
The electron stream will be pulled downward
B
The electron stream will be pulled upward
C
The electron stream will be retarted
D
The electron beam will be speeded up towards the right
Question 10
A small cylindrical soft iron piece is kept in a galvanometer so that
A
A uniform magnetic field is produced
B
There is a steady deflection of the coil
C
All of these
D
A radial uniform magnetic field is produced
Question 11
“On flowing current in a conducting wire the magnetic field produces around it.” It is a law of

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A
Ampere
B
Lenz
C
Ohm
D
Maxwell
Question 12
If two streams of protons move parallel to each other in the same direction, then they
A
Do not exert any force on each other
B
Get rotated to be perpendicular to each other
C
Repel each other
D
Attract each other
Question 13
A current flows in a conductor from east to west. The direction of the magnetic field at a points above the conductor is ..
A
Towards west
B
Towards east
C
Towards south
D
Towards north
Question 14
Two straight horizontal parallel wires are carrying the same current in the same direction, d is the distance between the wires. You are provided with a small freely suspended magnetic needle. At which of the following positions will the orientation of the needle be independent of the magnitude of the current in the wires
A
At a distance d/2 from any of the wires in the horizontal plane
B
At a distance d/2 from any of the wires
C
Anywhere on the circumference of a vertical circle of radius d and centre halfway between the wires
D
At points halfway between the wires in the horizontal plane
Question 15
The magnetic field at a distance r from a long wire carrying current i is 0.4 Tesla. The magnetic field at a distance 2r is
A
0.2 Tesla
B
0.1 Tesla
C
1.6 Tesla
D
0.8 Tesla
Question 16
A charged particle enters a magnetic field H with its initial velocity making an angle of 45o with H. The path of the particle will be
A
An ellipse
B
A straight line
C
A circle
D
A helix
Question 17
A wire carrying current I and other carrying 2I in the same direction produces a magnetic field B at the mid point. What will be the field when 2I wire is switched off
A
B
B
4B
C
B / 2
D
2B
Question 18
The sensitiveness of a moving coil galvanometer can be increased by decreasing

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A
The couple per unit twist of the suspension
B
The magnetic field
C
The area of the coil
D
The number of turns in the coil
Question 19
Two parallel beams of electrons moving in the same direction produce a mutual force
A
Downwards perpendicular to plane of paper
B
Upwards perpendicular to plane of paper
C
Of repulsion in plane of paper
D
Of attraction in plane of paper
Question 20
A uniform magnetic field acts at right angles to the direction of motion of electrons. As a result, the electron moves in a circular path of  radius 2 cm. If the speed of the electrons is doubled, then the radius of the circular path will be
A
4.0 cm
B
2.0 cm
C
0.5 cm
D
1.0 cm
Question 21
At a distance of 10 cm from a long straight wire carrying current, the magnetic field is 0.04 T. At the distance of 40 cm, the magnetic field will be
A
0.16 T
B
0.02 T
C
0.01 T
D
0.08 T
Question 22
A charged particle is released from rest in a region of steady uniform electric and magnetic fields which are parallel to each other the particle will move in a
A
Straight line
B
Cycloid
C
Helix
D
Circle
There are 22 questions to complete.
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