Physics

Problem

A Wheatstone bridge has the following arm resistances:

R_1 = 120\,\Omega

(AB),

R_2 = 100\,\Omega

(BC),

R_3 = 200\,\Omega

(AD) and

R_4 = 210\,\Omega

(DC). A galvanometer of resistance

30\,\Omega

is connected between B and D and a

12\,\text{V}

battery (having negligible internal resistance) is connected between A and C. (i) Determine the potential difference between the junctions B and D. (ii) Calculate the magnitude of current through the galvanometer. (iii) State clearly the junction (B or D) that is at the higher potential.

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