Question 391: Current Electricity

Question

In the given circuit all resistances are of value $R$ $ohm$ each. The equivalent resistance between $A$ and $B$ is :

Accepted Answer

Let us assume potential at point M is X volts. Now you can see a plain wire is directly connected between point N and point M so point N will also have same potential as point M.
Similarly,  a plain wire is directly connected between point N and point O so point O will also have same potential as point N.
Also, a plain wire is directly connected between point O and point P so point P will also have same potential as point O.
Now you can see point P and point M both have same potential X, so no current will flow through that path so you can remove that resistor. Similarly, as point O and point M both have same potential X, so no current will flow through that path also so you can remove that resistor too.
So new circuit becomes
$ 	herefore $ R
AB
= R + R = 2R

Answer

$2R$

Answer

$3R$

Answer

${{5R} \over 3}$

Answer

${{5R} \over 2}$

Current Electricity

In the given circuit all resistances are of value R ohm each. The equivalent resistance between A and B is :

Choose the correct answer: