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Problem
Problem
What is the value of
B
B
B
that can be set up at the equator to permit a proton of speed
10
7
10^7
1
0
7
m/s to circulate around the earth?
[
R
=
6.4
×
10
6
m
,
m
p
=
1.67
×
10
−
27
kg
]
[R = 6.4 \times 10^6 \text{ m}, m_p = 1.67 \times 10^{-27} \text{ kg}]
[
R
=
6.4
×
1
0
6
m
,
m
p
=
1.67
×
1
0
−
27
kg
]
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