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[(Magneric.effect" of current and magnet...

[(Magneric.effect" of current and magnetic force on charge or current ")/(" 15.A long,thick straight conducts of radius "R" carries current I unifornity distributed in its cross section ")],[" area.The raifo of energh density of the magnetic field at distance R/2from surtace inside the conductor "],[" and outside the conductoris: "],[[" (1) "1:16," (2) "1:1," (3) "1:4," (4) "9196]]

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