Equal lengths of wires A and B are connected the left and the right gap respectively of a meter bridge. The null point is obtained at 0.4 m from the l

Question

Equal lengths of wires A and B are connected the left and the right gap respectively of a meter bridge. The null point is obtained at 0.4 m from the l

Equal lengths of wires A and B are connected the left and the right gap respectively of a meter bridge. The null point is obtained at 0.4 m from the left end of the wire. If the diameters of the wires A and B are in the ratio 2:3 . Then the ratio of specific resistances of the materials of the wires will be
A. `8:27`
B. `8:15`
C. `27:8`
D. `15:8`

Monjur Alahi

7 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

Correct Answer - A
`(R_(1))/(R_(2))=(l_(x))/(l_(r))`
`:.(rho_(1))/(rho_(2))xx(l_(1))/(l_(2))xx(A_(2))/(A_(1))=(l_(x))/(l_(r))`
`:.(rho_(1))/(rho_(2))=(l_(2))/(l_(1))xx(r_(1)^(2))/(r_(2)^(2))`
`=4/9xx4/6=8.27`

7 views Answered 2023-02-05 15:29