A thin conducting ring of radius r has an electric charge +Q.What would be the increase in the tension of the wire,if a point +Q' is placed at the centre of the ring?

Asked by Rohan Mehra | 25th May, 2011, 01:03: AM

Expert Answer:

When the wire is given charge q=+Q. it comes in tension, called hoop tension. When another charge =+Q',is placed at the centre of the ring, the tension in the wire increases to keep this segment into equillibrium again.
Consider an elementary strip subtending angled  at its centre.
The string is in equillibrium in X-direction.For equillibrium in y-direction,
Charge on elementary strip =

Answered by  | 24th May, 2011, 09:27: PM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.