Jumper cables used to start a stalled vehicle often carry a 65-A current. How strong is the magnetic field 5.5 cm from one cable? Compare to the Earth's magnetic field (5.0×10−5 T).
here,
current , I = 65 A
distance from cable , r = 0.055 m
magnetic feild , B = u0*I /( 2 * pi * r)
B = 1.26 * 10^-6 * 65 /( 2 * pi * 0.055)
B = 2.36 * 10^-4 T
the magnetic feild is 2.36 * 10^-4 T
Be = 5 * 10^-5 T
B = 2.36 * 10^-4 /( 5 * 10^-5) * Be
B = 4.73 * Be
the magnetic feild is 4.73 times the earth's magnetic feild
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