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- The magnitude of the electric field at a distance r from a point charge Q is equal to Q/4πε0r2. How close to a water molecule (of polarizability volume 1.48 × 10−30 m3) must a proton approach before the dipole moment it induces has a magnitude equal to that of the permanent dipole moment of the molecule (1.85 D)?How much is the energy required for vacancy formation for Pb at its melting temperature of 620.6°F if the fraction of atom sites that are vacant is 2.41x10-5? Solve LegiblyProton 1 moves with a speed v from theeast coast to the west coast in the continental United States; proton 2 moves with the same speed from the southern United Statestoward Canada. (a) Is the magnitude of the magnetic force experienced by proton 2 greater than, less than, or equal to the forceexperienced by proton 1? (b) Choose the best explanation fromamong the following:I. The protons experience the same force because the magneticfield is the same and their speeds are the same.II. Proton 1 experiences the greater force because it moves atright angles to the magnetic field.III. Proton 2 experiences the greater force because it moves in thesame direction as the magnetic field.