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Grade: 9

                        

why meter bridge has plates instead of wire? why meter bridge measures more accurat resistance than wheatstone bridge ?

2 years ago

Answers : (1)

Saptarshi ghosh
19 Points
							Part 1Metre bridge has plates instead of wires because wires provide more resistance than plates as plates have more area of cross section than wires which can be equated asV=IR; but I =neAVdtherefore, V=neAVd*ROr , R=V/(neAVd),Hence R proportional to 1/AThus, with increase in Area(A),resistance (R) decreases. Part 2Metre bridge is actually based on the principle of  Wheatstone  bridge thus both are same. And it is  based on balanced reading of galvanometer which measures resistance by proportion of resistances.so please check the  question  and understand the question and concept of wheatstone bridge.I think answer will get clear.
						
2 years ago
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