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Class 12 NEET Physics Moving Charges and Magnetism
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© examsnet.com
Question : 41
Total: 96
A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected in the region such that its velocity is pointed along the direction of fields, then the electron
(2011)
will turn towards right of direction of motion
speed will decrease
speed will increase
will turn towards left of direction of motion
Validate
Solution:
Force on electron due to electric field,
→
F
E
=
−
e
→
E
Force on electron due to magnetic field,
→
F
B
=
−
e
(
→
v
×
→
B
)
=
0
Since
→
v
and
→
B
are in the same direction.
Total force on the electron,
→
F
=
→
F
E
+
→
F
B
=
−
e
→
E
Electric field opposes the motion of the electron, hence speed of the electron will decrease.
© examsnet.com
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