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    pushpa_bhagat's Avatar
    pushpa_bhagat Posts: 39, Reputation: 1
    Junior Member
    		  
    #1

    Dec 21, 2010, 06:25 AM
    In a semi circular ring of radius R.potential at centre?
    jcaron2's Avatar
    jcaron2 Posts: 986, Reputation: 204
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    #2

    Dec 21, 2010, 08:08 AM
    We need more information. Is there a charge on the ring? Perhaps a verb would be useful too.
    pushpa_bhagat's Avatar
    pushpa_bhagat Posts: 39, Reputation: 1
    Junior Member
    		  
    #3

    Dec 22, 2010, 06:38 AM
    Comment on jcaron2's post
    Ring has +ive charge .
    harum's Avatar
    harum Posts: 339, Reputation: 27
    Full Member
    		  
    #4

    Dec 22, 2010, 10:42 AM
    Consider the ring as a set of equidistant point charges and remember the superposition proiciple and that potential is a scalar. A semicircular ring is nothing else but a lot of point charges q arranged in a certain geometry around the center. You know what the potential of a point charge is. It is proportional to q/R. Each of those imaginary point charges makes the same contribution into the total potential at the center, because they all are the same distance R away from the center. Sum over all charges.
    pushpa_bhagat's Avatar
    pushpa_bhagat Posts: 39, Reputation: 1
    Junior Member
    		  
    #5

    Jan 12, 2011, 06:29 AM
    Comment on harum's post
    Help me . Make of this problem.
    pushpa_bhagat's Avatar
    pushpa_bhagat Posts: 39, Reputation: 1
    Junior Member
    		  
    #6

    Jan 12, 2011, 06:31 AM
    Comment on harum's post
    I .want ans in form of derivation .with explanation
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