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.)

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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