Car Radio Antenna
Mar 26
2010
2010
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how to calculate the emf of a car antenna moving 80 km/h through Earth's magnetic field?
a car with a radio antenna 1 m long travels at 80 km/h in a locality where the Earth's magnetic field is 5 x 10^-5 T. What is the maximum possible emf induced in the antenna as a result of moving through the Earth's magnetic field?
The maximum emf e = BLv will occur if the field, the movement and the antenna are all mutually perpendicular.
Then e = 5e-5 T x 1 m x 80000m/3600s = 1.11e-3 V = 1.11 mV
[Note conversion from km/h to m/s]
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