A wire of thickness d = 5 mm is tightly wound 200 times around a cylindrical core to form a solenoid. A current I = 0.1 A is sent through the wire. What is the the magnetic field on the axis of the solenoid?
A)
6.6 × 10-5 T
B)
2.5 × 10-5 T
C)
1.3 × 10-5 T
D)
3.6 × 10-5 T
E)
9.8 × 10-5 T
B
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A 100-kW radio station emits EM waves in all directions from an antenna on top of a mountain. What is the intensity of the signal at a distance of 10 km?
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