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Class 12
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Physics
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Moving Charges and Magnetism
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Medium Questions
Moving Charges And Magnetism
Physics
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Easy Qs
Med Qs
Hard Qs
>
An electron is projected into a magnetic field along the lines of force. Then
A
there will be no effect on its motion
B
the electron will travel along a circle and its speed remains unchanged
C
the electron will follow the path of a parabola and its speed will increase
D
the velocity will increase in magnitude but its direction will remain unchanged.
Medium
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>
When a charged particle moves through a magnetic field, the quantity which is not affected in the magnetic field is:
A
particle velocity
B
particle acceleration
C
linear momentum of the particle
D
kinetic energy of the particle
Medium
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>
The force felt by an electron on entering into a magnetic field is independent of its
A
Charge
B
Strength of the field
C
Mass
D
Direction of its velocity
Medium
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>
The magnetic field
d
B
due to a small current element dl at a distance
r
and carrying current ‘i’ is
A
d
B
=
4
π
μ
0
i
(
r
d
l
×
r
ˉ
)
B
d
B
=
4
π
μ
0
i
2
(
r
2
d
l
×
r
ˉ
)
C
d
B
=
4
π
μ
0
i
2
(
r
d
l
×
r
ˉ
)
D
d
B
=
4
π
μ
0
i
(
r
3
d
l
×
r
ˉ
)
Medium
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>
When an electron moves through a magnetic field, its speed will
A
decrease.
B
increase.
C
remain the same.
D
increase first and then decrease.
Medium
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>
Magnetic field at a point on the line of current carrying conductor is
A
maximum
B
infinity
C
zero
D
finite value
Medium
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>
An electron enters a magnetic field with a speed of
1
0
8
c
m
/
s
. The particle experiences a force due to the magnetic field and the speed of the electron
A
will decrease
B
will increase
C
will remain constant
D
may in crease or decrease
Medium
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>
A cathode ray beam is bent into an arc of a circle of radius
0
.
0
2
m
by a field of magnetic induction
4
.
5
5
m
T
. The velocity of electrons is:
(Given
e
=
1
.
6
×
1
0
−
1
9
c
and
m
=
9
.
1
×
1
0
−
3
1
k
g
)
A
2
×
1
0
7
m
/
s
B
3
×
1
0
7
m
/
s
C
1
.
6
×
1
0
7
m
/
s
D
3
.
2
×
1
0
7
m
/
s
Medium
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>
The magnetic field due to a current element is independent of :
A
current through it
B
distance from it
C
its length
D
nature of meterial
Medium
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>
A neutron , a proton, an electron and an
α
particle enter perpendicular uniform magnetic field, with the same uniform velocity. The path of electron in the following figure will be :
A
4
B
3
C
2
D
1
Medium
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>