Question: 1) A low-power college radio station broadcasts 10 Wof electromagnetic waves.
At what distance from the antenna is the electric field amplitude 2.0Ã-10âˆ'3V/m, the lower limit at which good reception is possible?
Express your answer to two significant figures and include the appropriate units.
2) A TMS (transcranial magnetic stimulation) device creates very rapidly changing magnetic fields. The field near a typical pulsed-field machine rises from0 T to 2.5 T in 200 μs. Suppose a technician holds his hand near the device so that the axis of his 2.1-cm-diameter wedding band is parallel to the field.
Part A
What emf is induced in the ring as the field changes?
Express your answer to two significant figures and include the appropriate units.
Part B
If the band is made of a gold alloy with resistivity 6.2Ã-10âˆ'8Ωâ‹...m and has a cross-section area4.5 mm2 , what is the induced current?
Express your answer to two significant figures and include the appropriate units.