In metre bridge experiment box(R=2ohom)is Connect in left gap and unknown resistance S in right gap. If balancing length be 50cm calculate value of S?
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2
Answer:
R*8+35*4
Explanation:
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Answer:
Null point is found at l1=40 cm
Using balanced Wheatstone bridge condition, X2=100−l1l1
∴ X2=100−4040
⟹ X=3Ω
Case 2 :
New null point is found at l2=50 cm
Using balanced Wheatstone bridge condition, X′2=100−l2l2
∴ X′2=100−5050
⟹ X′=2Ω
Since the unknown resistance gets decreased, thus we have to connect a resistance R in parallel to X so that X′ comes out to be 2Ω.
Thus resistance of parallel combination X′=X+RXR
∴ 2=3+R3R
= R=6Ω
Hence 6Ω must be connected in parallel to unknown resistance
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