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JEEMAIN-2014
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Q)
A positive charge ' q ' of mass ' m ' is moving along the
+
x
axis .We wish to apply a uniform magnetic field B for time
Δ
t
so that the charge reverses its direction crossing the y- axis at a distance d . Then :
(
a
)
B
=
m
v
q
d
a
n
d
Δ
t
=
π
d
v
(
b
)
B
=
m
v
2
q
d
a
n
d
Δ
t
=
π
d
2
v
(
c
)
B
=
2
m
v
q
d
a
n
d
Δ
t
=
π
d
2
v
(
d
)
B
=
2
m
v
q
d
a
n
d
Δ
t
=
π
d
v
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