JEE PHYSICS MCQ: CURRENT ELECTRICITY

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Application +4 | -1

Three resistance

P,\,\,Q,\,\,R

each of

2\,\,\mathrm{\Omega }

and an unknown resistance S form the four arms of a wheatstone bridge circuit. When a resistance of

6\,\,\mathrm{\Omega }

is connected in parallel to

S

the bridge gets balanced. What is the value of

S

View answer and explanation

Correct option: B

3\,\,\mathrm{\Omega }

Option C (

6 \,\Omega

) is correct because when the bridge is balanced, the ratio of resistances in opposite arms must be equal. The equivalent resistance of S in parallel with 6 ohms is used in the Wheatstone bridge equation.

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