Physics Calculations

Useful Information: c = 3.0 x 108 m/s

1.) How much current will flow in a wire 2.00 meters long if the force on it is 0.810 N when it is placed in a uniform magnetic field of 0.0300 T (T = Teslas) ?

2.) Suppose that you want to make a telephone call to New York City using a landline. If you call from San Francisco, which is 4,000 km from New York, how long will it
take before your friend in New York hears your voice? (Hint: the speed of EM waves on transmission lines is c, where c = 3.0 x 108 m/s is also the “speed of light” in
empty space. You may ignore any electronic delays in the system.)

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3.) An FM station broadcasts at 91.5 MHz. What is the wavelength of this radio wave? (M = Mega = 106, so MHz means “Megahertz, or a million Hertz.)

4.) A red light has a wavelength of 620 nm. What is the frequency? (n = “nano” = 10-9, so “nm” means “nano-meter” or a billionth of a meter)

5.) The speed of light in ice is 2.29 x 108 m/s. What is the index of refraction of ice?


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