A thin transparent film with refractive index 1.4 is held on a circular ring of radius 1.8 cm. The fluid in the film evaporates such that transmission through the film at wavelength 560 nm goes to a minimum every 12 seconds. Assuming that the film is flat on its two sides, the rate of evaporation is:

Question

Four long straight thin wires are held vertically at the corners A, B, C and D of a square of side \( a \), kept on a table and carry equal current \( I \). The wire at A carries current in upward direction whereas the current in the remaining wires flows in downward direction. The net magnetic field at the centre of the square will have the magnitude:

Answer 1

The evaporation rate correlates with the thickness alteration, which induces a shift in the interference pattern. The evaporation rate is determinable from the provided data and the wavelength of minimum transmission using the formula: \[ {Rate of evaporation} = \pi \times 10^{-13} \, {m}^3/{s} \]

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