An electricity and magnetism problem by Hammad Shah
Electricity and Magnetism
Level
2
A wire has a resistance 12 ohm. It is bent in the form a circle. The effective resistance between the two points on any diameter of the circle is
24 ohm
12 ohm
3 ohm
6 ohm
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
1 solution
Since resistance is directly proportional to the length of wire,hence both upper and lower part of circle have resistance equal to 6 ohm. They are connected in parallel . So equivalent resistance equal to 1/R =(1/6) +(1/6) R=3 ohm
note-upper part means ,if i have drawn horizontal diameter then part of wire above this diameter,lower part (part of wire below horizontal diameter).then connect a battery to the ends of this diameter , potential drop across upper part will be same as lower part ,so they are in parallel.
i do not know how to draw figure here, so extremely sorry.