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CGPET 2013 Solved Paper
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© examsnet.com
Question : 25
Total: 150
An electron enters in a magnetic field of
1.0
k
N/A-m with a speed of
(
2
i
−
3
j
)
m
−
1
. Calculate the Lorentz force acting on the electron
−
1.6
(
3
i
−
2
j
)
×
10
19
N
1.6
(
3
i
+
2
j
)
×
10
19
N
−
1.6
(
3
i
+
2
j
)
×
10
19
N
1.6
(
3
i
−
2
j
)
×
10
19
N
Validate
Solution:
Here,
v
=
(
2
i
−
3
j
)
m
∕
s
and
B
=
1.0
k
N
∕
A
−
m
Lorentz force,
F
=
e
(
v
×
B
)
=
(
−
1.6
×
10
−
19
)
(
2
i
−
3
j
)
×
(
1
k
)
]
=
(
−
1.6
×
10
−
19
)
[
2
(
i
×
k
)
−
3
(
j
×
k
)
]
=
(
−
1.6
×
10
−
19
)
[
2
(
−
j
)
−
3
(
i
)
]
=
1.6
(
3
i
+
2
j
)
×
10
−
19
N
© examsnet.com
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