Electricity

Nupur Goel's Avatar
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Joined: 13 Dec 2006
Post: 666
18 Dec 2006 13:16:27 IST
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doubt in electrostatics...
Engineering Entrance , Medical Entrance , NEET , JEE Main , AIIMS , JEE Main & Advanced , Physics , Electricity

A non-conducting ring of radius 0.5 m carries a total charge of 1.11 * 10-10 C distributed non-uniformly on its circumference producing an electric field
E    everywhere in space.The value of the line integral  
l = 0    
     -  E . dl ,  ( l = 0 being the centre of the ring )  in volt is,
l =
 
a.     +2              b.     -1             c.     -2           d.     zero 



Comments (1)

rashmi_jain's Avatar

Forum Expert
Joined: 6 Dec 2006
Posts: 97
18 Dec 2006 20:38:45 IST
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hiii
see,this integral is nothing but change in potential energy
 
vb-va=[a][b]E.dl 
so,here b=0 and a=infinity
 
v=kq/r   where k= 9*109
vinfinty = 0 as r=infinity
v0= k *q/r=2
 
therefore answer is 2-0=2
choice (a)



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