Rotation of free fields in vacuum vectors as linear combinations of the usual electric and magnetic field vectors: 2.7 let θ be a parameter and define "new" electric and magnetic field c =-esin (a) show that e and b satisfy the maxwell equations without sources (ρ司 0) if e and b satisfy these equations. (b) discuss the implications of this result for source-free solutions of the maxwell equations where e lb everywhere in space.

Aballoon is rising vertically upwards at a velocity of 10m/s. when it is at a height of 45m from the ground, a parachute bails out from it. after 3s he opens his parachute and decelerates ata a constant rate 5m/s.when. (a) what was the height of the parachutist above the ground when he opened his parachute? (b)how far is the parachutist from the balloon at t=3s? (c)with what velocity does the parachutist hit the ground? (d)after how long does the parachutist hit the ground after his exist from the balloon?