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Question
Which modifications are necessary to determine the resistance of solution by the usual method of measurements on Wheatstone's bridge principle?
Which modifications are necessary to determine the resistance of solution by the usual method of measurements on Wheatstone's bridge principle?
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Solution
The correct option is D All of the above
All of the following modifications are necessary to determine the resistance of solution by the usual method of measurements on Wheatstone's bridge principle.
(A) A.C. should be used.
(B) A conductivity cell is used.
(C) The galvanometer is replaced by magic eye or headphone arrangement.
If D.C. is used, electrolyte solution will go electrolysis and the change in concentration during the passage of current will not allow reaching the steady value of the null point. In A.C. galvanometer does not work. Also to put the solution at one end in the gap of the meter bridge, a conductivity cell is needed.
Hence, the correct option is D
All of the following modifications are necessary to determine the resistance of solution by the usual method of measurements on Wheatstone's bridge principle.
(A) A.C. should be used.
(B) A conductivity cell is used.
(C) The galvanometer is replaced by magic eye or headphone arrangement.
If D.C. is used, electrolyte solution will go electrolysis and the change in concentration during the passage of current will not allow reaching the steady value of the null point. In A.C. galvanometer does not work. Also to put the solution at one end in the gap of the meter bridge, a conductivity cell is needed.
Hence, the correct option is D
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