JEE PHYSICS MCQ: CURRENT ELECTRICITY

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Application +4 | -1

A,\,\,B,\,C

and

D

are four resistances of

2\,\,\mathrm{\Omega },\,\,2\,\,\mathrm{\Omega },\,\,2\,\,\mathrm{\Omega }\,\,\mathrm{and}\,\,3\,\,\mathrm{\Omega }

respectively. They are used to form a Wheatstone bridge. The resistance

D

is short circuted with a resistances

\mathrm{R}

in order to get the bridge balanced. The value of

R

will be

View answer and explanation

Correct option: B

6\,\,\mathrm{\Omega }

Option B (6 Ω) is correct because it satisfies the Wheatstone bridge balance condition after short-circuiting resistance D with R.

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\mathrm{\rho }

3\,\,{\mathrm{m}^3}

3\,\,\mathrm{\Omega }

4.7\,\, \times \,\,{10^6}\,\,\mathrm{\Omega }\,\, \pm \,\,5\,\,\%

22.5\,cm