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Physics
Physics
Problem
A particle of mass
m
m
m
and charge
q
q
q
has an initial velocity
v
⃗
=
v
0
j
^
\vec{v} = v_0 \hat{j}
v
=
v
0
j
^
. If an electric field
E
⃗
=
E
0
i
^
\vec{E} = E_0 \hat{i}
E
=
E
0
i
^
and magnetic field
B
⃗
=
B
0
i
^
\vec{B} = B_0 \hat{i}
B
=
B
0
i
^
act on the particle, its speed will double after a time: a.
2
m
v
0
q
E
0
\frac{2mv_0}{qE_0}
q
E
0
2
m
v
0
b.
3
m
v
0
q
E
0
\frac{3mv_0}{qE_0}
q
E
0
3
m
v
0
c.
3
m
v
0
q
E
0
\frac{\sqrt{3}mv_0}{qE_0}
q
E
0
3
m
v
0
d.
2
m
v
0
q
E
0
\frac{\sqrt{2}mv_0}{qE_0}
q
E
0
2
m
v
0
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