Wheatstone bridge is the most sensitive when all the four resistances are of the same order of magnitude.
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B
In a balanced Wheatstone bridge if the cell and the galvanometer are exchanged, the null point is disturbed.
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C
A rheostat can be used as a potential divider.
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D
Kirchhoff’s second law represents energy conservation.
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Solution
The correct option is B
In a balanced Wheatstone bridge if the cell and the galvanometer are exchanged, the null point is disturbed.
(1) The Wheatstone bridge is the name given to a set of four resistances that are linked together to produce a null center value.
(2) Today, digital multimeters are the most convenient technique to measure resistance.
(3) Wheatstone, can be used to reliably measure unknown resistance values or to calibrate measuring equipment, voltmeters, and ammeters, among other things
(4) The Wheatstone Bridge can be used to determine the value of an unknown resistance by comparing it to a known resistance.
(5) This allows very low resistance values in the milli-Ohms range to be measured.
(6) Even if the cell and galvanometer are switched in a balanced Wheatstone bridge, the null point remains the same..
So, we can say that in a balanced Wheatstone bridge the null point does not change even if the cell and galvanometer interchanged.
