A resistance of `2Omega` is connected across one gap of a metre-bridge(the length of the wire is 100 cm) and an unknown resistance, greater than `2Ome

Question

A resistance of `2Omega` is connected across one gap of a metre-bridge(the length of the wire is 100 cm) and an unknown resistance, greater than `2Ome

A resistance of `2Omega` is connected across one gap of a metre-bridge(the length of the wire is 100 cm) and an unknown resistance, greater than `2Omega`, is connected across the other gap. When these resistances are interchanged, the balance points shifts by 20 cm. Neglecting any corrections, the unknown resistance is
A. `3 Omega`
B. `4 Omega`
C. `5 Omega`
D. `6 Omega`

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Answer A) 3 ohm

Soln-:

2/x=y/(100-x)

200-2x=xy ......1

After interchanging

Y/x+20 = 2/(80-x)

80y-xy=2x+40 .......2

On solving equation 1 and 2

Y=3 ohm

4 views Answered 2023-02-05 15:29