एन इलेक्ट्रॉन रिचार्ज माइनसी एंड मास एम ट्रैवल अट ए स्पीड बी इन
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Answer:
Given,
Mass of electron=m
Charge of electron=q
Velocity of electron=V
Radius of electron = r
Magnetic field =B
We know that force due to magnetic field, F
B
=qvB
Now if V
′
=2V and B
′
=
2
B
Then F
B
′
=qV
′
B
′
=q(2V)(
2
B
)
F
B
=
r
mV
2
⟹r=
qVB
mV
2
⟹r=
qB
mV
and
r
′
=
q(
2
B
)
m(2V)
r
′
=4r
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