1. A straight wire carries a current of 3 A. Calculate
the magnitude of the magnetic field at a point 10 cm
away from the wire.
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questions...
A long straight wire carries a current 10 amp. An electron travels with a velocity 5.0×10
6
m/sec parallel to the wire 0.1 m away from it and in a direction opposite to the current. What force does the magnetic field of current exert on the electron?
Answer=
B=
4π
μ
0
.
r
2i
=10
−7
×
0.1
2×10
=2×10
−5
wb/m
2
F=qvBsinθ
=(1.6×10
−19
)(5×10
6
)(2×10
−5
)sin90
0
=1.6×10
−17
Newton.
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