Five charges each `q` are placed at five corners regular pentagon. Distance from corner to the centre of pontagon is `r`. Then `

Five charges each `q` are placed at five corners regular pentagon. Distance from corner to the centre of pontagon is `r`. Then `(K=(1)/(4pi epsilon_(0)))`
A. potential at centre is `(5kq)/(r)`
B. potential at centre is zero
C. electric field at centre is non-zero
D. electric field at centre is zero

Five charges each `q` are placed at five corners regular pentagon. Distance from corner to the centre of pontagon is `r`. Then `(K=(1)/(4pi epsilon_(0

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