A2.10 cm × 2.10 cm square loop of wire with resistance 1.30×10−2 ω has one edge parallel to a long straight wire. the near edge of the loop is 1.10 cm from the wire. the current in the wire is increasing at the rate of 130 a/s .

Ascientist notices that an oil slick floating on water when viewed from above has many different colors reflecting off the surface, making it look rainbow-like (an effect known as iridescence). she aims a spectrometer at a particular spot and measures the wavelength to be 750 nm (in air). the index of refraction of water is 1.3