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KCET 2024 Physics Solved Paper
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© examsnet.com
Question : 26
Total: 60
A particle of specific charge
q
m
=
π
C
kg
−
1
is projected from the origin towards positive x - axis with the velocity
10
ms
−
1
in a uniform magnetic field
→
B
=
−
2
k
T
. The velocity
→
v
of particle after time
t
=
1
12
s
will be (in
ms
−
1
)
5
(
^
i
+
j
)
5
(
^
i
+
√
3
j
)
5
(
√
3
^
i
−
j
)
5
(
√
3
i
+
j
)
Validate
Solution:
q
m
=
π
Ckg
−
1
→
B
=
−
2
k
T
Time period
=
2
π
m
Q
B
=
2
π
2
⋅
1
π
=
1
s
e
c
It rotates by '
30
∘
' in
1
12
' second
After
1
12
second
→
V
=
10
cos
30
∘
^
i
+
10
s
i
n
30
∘
j
=
5
√
3
^
i
+
5
j
=
5
(
√
3
^
i
+
j
)
m
∕
s
© examsnet.com
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