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Electricity

Scorching goIITian

Joined:	24 Sep 2009
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9 Mar 2010 16:28:29 IST

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286

pLZ ANSWER THIS???????

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DEFINATION OF AN ELECTRIC FIELD IS E = Lt (q -> 0) F/q...........................hERE q TENDS TO ZERO...BUT WE KNOW THAT THE SMALLEST OR ELEMENTARY CHARGE IS +1.6*10-19 C or -1.6*10-19 C........CHARGE LESS THAN THIS CANNOT EXIST..... HOW DO WE JUSTIFY THAT THIS?????????????

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manish gupta

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Joined: 5 Mar 2010

Posts: 51

10 Mar 2010 10:49:29 IST

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This concept is just for understanding. you can also say the defination like electrical field by some charge is the coulamb force on a unit charge.

Deepak Aggarwal

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Joined: 9 May 2009

Posts: 766

10 Mar 2010 16:06:28 IST

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Its a good question. Actually we use the limit in the expression just to neglect the effect on the charge due to the electric field of source charge.

Yagyadutt Mishra

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Joined: 19 Feb 2009

Posts: 1983

10 Mar 2010 16:39:16 IST

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Lim q-->0 mathematically gives a conclusion that value of charge is decreased...but physically it establish a concept that from a specified region you have removed all the region.........

Means suppose a non uniform geometrical figure and there exist soem charges in it....now to determine what is the field in the region is.....physically removing all the charges...and cosidering unit charges at respective places......and then the expression of force will give expression for EF

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