A plastic rod has been formed into a circle of radius R. It has a positive charge `+Q` uniformly distributed along one-quarter of its circumference and a negative charge of ` -6Q` uniformly distributed along the rest of the circumference (figure). With V = 0 at infinity, what is the electric potential `-6Q`(a) at the centre C of the circle and(b) at point P, which is on the central axis of the circle at distance z from the centre?

A plastic rod has been formed into a circle of radius R. It has a posi

1.	A plastic rod has been formed into a circle of radius R. It has a positive charge `+Q` uniformly distributed along one-quarter of its circumference and a negative charge of ` -6Q` uniformly distributed along the rest of the circumference (figure). With V = 0 at infinity, what is the electric potential `-6Q`(a) at the centre C of the circle and(b) at point P, which is on the central axis of the circle at distance z from the centre?
Answer» Correct Answer - D `a. V_C=(k.q_("net"))/R=(1/(4piepsilon_0)((-5Q)/R)` `b. V_p=(kq_("net"))/r` where r=distance of P from any point on circumfrence `=(1/(4piepsilon_0))((-5Q)/(sqrt(R^2+z^2)))`

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