# Railgun Physics

Jun 17th, 2015
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The underlying physics involved in the railgun are rather simple. Current flowing through an inductor creates a magnetic field. The current flowing through the field creates a Lorentz force on the inductor tending to push the coil apart. If one portion of the coil is free to move, this portion will slide away from the power source.

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CHAPTER # 12Q#1 The potential is constant throughout a given region of space .is the electric field is zero or non zero in this region?Ans#1:Electric field E and potential difference are related by equation, E =-v/rWhen the potential is taken as constant which means v= constant then the potential difference becomes zero v=0 so, E =0/r E = 0This relation tells that electric field is zero in a region of where the potential is constantQ#2: Suppose that you follow an electric field line due to a positive point charge .do electric field and the potential increases or decreases?Ans#2:Relation for the electric field and and electric potential areE= 1/40xq/r2 and v=1/40xq/r this gives for same charge E 1/ r2 V 1/ r When we follow electric field line due to positive charge, distance from positive charge increases which cases to decrease electric field and potential.Q#3:How can you identify that which plate of a capacitor is positively charged? Ans#3:When a freely suspended positively charged gold leaf of electroscope is brought near to one of the plates of capacitor the divergence to gold leaf shows that the plate of the capacitor is positively charged otherwise negatively charged..Q#4:Describe the force or forces on a positive point

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