1) a,b,c ?????
FROM SPECIAL THEORY OF RELATIVITY!!
i have no doubt in that...i juzz want to know what is phase in electrostats....
and also see the 2nd Q
2nd q: it is similar to y birds do not get electrified when sitting on bare wire...iof we are air borne and then touch a bare wire, then, will v get a shock???
phase out here can be the phase in SHM and therefore it is dependent on the motion of the body