What should be the potential difference across an aluminium wire of length 0.5m and cross section area 10^-6 m^2 such that a current of 2A passes through it? Answer is: 2.85 × 10^-2 V

solution?​

What is the temperature in degrees celsius of a substance with a tempature of 49k

Ultraviolet radiation is dangerous because it has a high enough energy to damage skin cells. what is the best explanation of the relationship between wavelength and wave energy? a) wave energy is related only to frequency, not wavelength. b) longer wavelengths have lower frequencies but higher energy. c) the shorter the wavelength, the lower the frequency and the higher the energy. d) the shorter the wavelength, the higher the frequency and the higher the energy.

Athird point charge q3 is now positioned halfway between q1 and q2. the net force on q2 now has a magnitude of f2,net = 5.861 n and points away from q1 and q3. what is the value (sign and magnitude) of the charge q3?