Physics-Electromagnetism (SMART INSTITUTE)
01-The magnetic field produced due to the current in a straight wire is proportional to the:
Electric current
Length of the wire
Conducting material
Diameter of the wire
02-A plotting compass is placed near a solenoid. When there is no current in the solenoid, the compass needle points due north as shown. When there is current from x to y, the magnetic field of the solenoid at the compass is equal in magnitude to the earth magnetic field at that point. In which direction does the plotting compass set?
0%
0
0%
0
0%
0
0%
0
03-The magnetic field of a solenoid is quite similar to that of a:
Straight conductor
Any magnet
A horse shoe magnet
A bar magnet
04-The magnetic field due to the electric current in a conducting wire is:
Towards the centre of the conducting wire
Circular around the conducting wire
In the direction of the electric current
In the direction opposite to the electric current
05-The diagram shows a current carrying conductor RS of length 2m placed perpendicular to a magnetic field of flux density 0.5 Tesla. The resulting force on the conductor is 1N acting into the plane of paper. What is the magnitude and direction of the current?
1 A from R to S
2A from R to S
1 A from S to R
2A from S to R
06-The diagram shows a small magnet hanging on a thread near the end of solenoid carrying a steady current I. What happens to the magnet as the iron core is inserted into the solenoid?
It moves towards the solenoid
It moves away from solenoid
It moves toward the solenoid and rotates through 180'
It moves away from solenoid and rotates through 180'
07-The direction of the magnetic lines of force depends upon:
Nature of the material of the conducting wire
Area of the conducting wire
Amount of the current
Direction of the current
08-The direction of magnetic lines of force can be found by using:
Right hand rule
Henry's law
Left hand rule
Faraday's law
09-Two parallel wires carrying currents in the opposite directions
Repel each other
Have no effect upon each other
Attract each other
They cancel out their individual magnetic fields
10-The direction of magnetic field for the solenoid is along:
Normal to the solenoid
Perpendicular to the axis of the solenoid
The axis of the solenoid
None of the above
11-The direction at a point on the magnetic lines of force can be taken along:
Normal at that point
The tangent at that point
Axis of the magnetic line of force at that point
Can't be taken
12-∮B⋅dl=μ0I This is known as
Coulomb's law
Newton's law
Ampere's circuital law
Kirchhoff current law
13-The magnetic field generated along the axis of a solenoid is proportional to:
Its length
Square of current flowing in it
Number of turns per unit length in it
Reciprocal of its radius
14-The relationship between Tesla and smaller unit Gauss of magnetic Induction is given by
1T=10^3 G
1T=10^-2 G
1T=10^-4 G
1T=10^4 G
15-A current carrying conductor is placed in a uniform magnetic field parallel to it. The magnetic Force experienced by the conductor is:
F=BIL
F=BLsinθ/I
F=I/BL sinθ
F=0
16-Magnetic field inside the solenoid is:
B=u0nI
B=ε0nI
B=u0I/n
B=ε0I/n
17-Magnetic field due to current carrying straight wire varies as
1/r^2
R^2
1/r
R
18-The strength of the magnetic field outside a solenoid is weak because
A-lines of forces are quite far from each other
B-the lines of forces are opposite to each other
C-the lines of forces are in the same direction and tend to cancel out the effect of each other d tend to cancel out
D-both A and C
19-Force on current carrying conductor per unit length is given by
IL sinθ
ILB
IL
IB sinθ
20-A positively charged particle moving due east enters a region of uniform magnetic field directed vertically upwards. The particle will:
Continue to move due east
Move in a circular orbit with its speed unchanged
Move in a circular orbit with its speed increases
Get deflected vertically upwards
21-A strong magnetic field is applied to a stationary electron, then
Electron move in the direction of field
Electron move opposite to field
Electron start spinning
Electron remain stationary
22-WOF in motion cannot be deflected by magnetic field?
Electron
Neutron
Proton
Sodium ion
23-The diagram shows the wire, carrying a current I, placed between poles of magnet. In which direction, does the force on the wire acts?
Downward
Toward the N pole of magnet
Upwards
Towards the S pole of magnet
24-A charged particle enters at 30' to the magnetic field. Its path becomes
Helical
Elliptical
Circular
Straight line
25-A conductor of length 1m and carrying current of 1A is placed at an angle of 45'to the magnetic field of 1G. The force acting on the conductor is:
Zero
1/√2 x 10^-4 N
1/√2 N
5 X 10^-4
26-A uniform magnetic field is represented by a set of lines of force which are
Parallel
Divergent
Convergent
None of these
27-Weber ampere per meter is equal to
Joule
Watt
Newton
Henry
28-A 10 eV electron is circulating in a plane at right angle to uniform field of magnetic induction 10^4 Wb/m^2. The orbital radius of the electron is
12 cm
16 cm
11 cm
18 cm
29-The figure shows line of field. This field is
Gravitational field
Magnetic field
Field of electron
All of these
30-When a charged particle is projected perpendicularly in a magnetic field, its trajectory is:
Hyperbola
Helix
Parabola
Circular
31-In a current carrying long solenoid, the magnetic field produced does not depend upon
Number of turns per unit length
Current flowing through solenoid
The radius of solenoid
All of above three
32-G.P Thomson's early experiments on the diffraction of the electrons b y crystals were criticized on the ground that the beams affecting the photographic plate might be X-rays. He proved that this was not so by placing bar magnets on each-side of the beam as shown in the diagram. How would the magnetic field due to magnetic affect the diffraction rings?
The rings would be deflected in the direction A
The rings would be deflected in the direction B
The rings would be deflected in the direction C
The rings would be deflected in the direction D
33-Current I is flowing in a long conducting wire, the magnetic induction at a distance r from it in 0.4 T, then its value at double the distance will be:
1.6 T
0.8T
0.2T
0.1T
34-The unit of E is NC^-1 and that of B is NA^-1 m^-1, THE UNIT OF e/b is
Ms^-2
Ms^-1
Ms
M^-1s^-1
35-A vertically straight conductor carries a current vertically upwards. A point P lies to the east of it at a small distance. Another point Q lies to the west at the same distance. The magnetic field at P neglecting earth's field is:
Greater than at Q
Less than at Q
Same as at Q
Greater or less than at Q
36-A straight conductor carries a current I, is split into a circular loop of radius r as shown in fig. The magnetic field at the centre o of the circle is
μ0 I/2r
μ0 I/πr
μ0 I/ 2πr
Zero
37-The magnitude of force on a moving charge is zero then angle between the velocity of the charge carrier and magnetic field is
0'
90'
45'
120'
38-A charged particle moves through a magnetic field in a direction perpendicular to it. Which of the following remain unchanged for the particle?
Velocity
Acceleration
Speed
Direction
39-Magnetic effect of current was discovered by:
Faraday
Kirchhoff
Oersted
Joule
40-A charged particle moves along a under the action of possible electric and magnetic fields. WOF is possible?
E=0, B=0
E=0, B≠0
E≠0, B=0
E≠0, B≠0
41-The relative permeability of ferromagnetic material is 10,000. Its absolute permeability will be
10^6 H/m
4π x 10^-3 H/m
4π x 10^-11 H/m
None of the above
42-The force on the conductor will be:
Downward
From left to right
From right to left
Upward
43-When a charged particle moves through a magnetic field, it suffers a change in
Direction
Speed
Energy
No change
44-A wire of length 2 m carries a current of 10 A. What is the force acting on it when it is placed at an angle of 45' to the uniform magnetic field of 0.15 T?
1.2 N
3.2 N
2.5 N
3/ √2 N
45-Magnetic field is caused by:
Stationary charge
A moving positive charge only
A moving negative charge only
Moving positive and negative charge both
46-A very long solenoid has 800 turns per meter length of solenoid. A current of 1.6 A flows through it. Then the magnetic induction at the middle point of the solenoid on its axis, is approximately
16 x 10^-4 T
8 X 10^-4 T
32 X 10^-4
4 X 10^-4 T
47-The magnetic field inside a solenoid is:
Zero
Non-uniform
Infinites
Uniform
48-A horizontal wire carries current at right angle to a horizontal magnetic field. The wire is then turned through 90' and so becomes parallel with the magnetic field. What describes the initial and final force on the wire?
Initial force = vertical, final force = 0
Initial force = vertically upward, final force = 0
Initial force = 0, final force = horizontal
Initial force = 0, final force = vertical
49-Two parallel wires carrying current in opposite direction:
Repel each other
Attract each other
No effect on each other
None of these
50-If length of solenoid is doubled, and number of turns is halved then B inside the solenoid becomes:
Half
Double
One fourth
Four times
51-An electron is moving along the axis of a solenoid carrying a current. WOF is a correct statement about the electromagnetic force acting on the electron?
The force acts radially inwards
The force acts radially outwards
The force acts in the direction of motion
No force acts
52-A long straight current carrying conductor has current direction from bottom to top when held vertically. What will be the direction of magnetic field lines when observed from below the conductor
Clockwise
Vertically upward
Anticlockwise
Vertically downward
53-Two long straight wires are set parallel to each other at separation r and each carries a current I in the same direction. The strength of the magnetic field at any point midway between the two wires is:
µ0 I/r
2µ0 I/r
2µ0 I/2r
Zero
54-Magnetic field inside a solenoid is
Directly proportional to current
Inversely proportional to current
Directly proportional to its length
Inversely proportional to the total number of turns
55-Magnetic lines of force
Are always intersect
Are always closed
Tend to crowd far away from the poles of a magnet
Don't pass through vacuum
56-A straight wire of diameter 0.5 mm carrying a current of 1 A is replaced by another wire of 1 mm diameter carrying same current. The strength of magnetic field away at the same distance
Twice the earlier value
One--half of the earlier value
One quarter of the earlier value
Same as the earlier value
57-The magnitude of the force on a moving charge is maximum when angle between the velocity of the charge and the magnetic field is:
0'
180'
90'
45'
58-When the current flowing through the wire is stopped, the magnetic field around the wire becomes.
Doubles
Half
Remains same
Zero
59-If a charge particle enters a uniform magnetic field, there is a change in its
Kinetic energy
Magnitude of velocity
Direction of velocity
All of these
60-PQRS is a square loop made of uniform conducting wire. If the current enters the loop at P and leaves at S, then the magnetic field will be:
Maximum at the centre of the loop
Zero at the centre of loop
Zero at all points inside the loop
Zero at all points outside the loop
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