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Grade: 12

                        

An unknown resistance is to be determined using resistances R1, R and R3. Their correspondins null points are A,B and C. Find which of the above will give the most accurate reading and why?? R=R1 or R2 or R3.

11 years ago

Answers : (1)

pratham ashish
9 Points
							hi,

accod. to wheat stone bridge,

null point means that the potential drop across x resistance = potential drop across legth of wire up  to the null point.

let length r La, Lb Lc resp. for the 3 null points measuring  form left hand corner.

then,  x/La = R1/L-La,(as resistance r parallel)
 similarly x/Lb =R2/L-LB and so on.

so u can know the value of unkwown.

accuracy will be in B part as the % error in measuring the length will b minimum.
						
11 years ago
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