MHT CET · Physics · Experimental Physics
In a meter bridge experiment null point is obtained at \(l \mathrm{~cm}\) from the left end. If the meter bridge wire is replaced by a wire of same material but twice the area of across-section, then the null point is obtained at a distance
- A \(2 l \mathrm{~cm}\) from left end.
- B \(l \mathrm{~cm}\) from left end.
- C \(l / 2 \mathrm{~cm}\) from left end.
- D \(l / 4 \mathrm{~cm}\) from left end.
Answer & Solution
Correct Answer
(B) \(l \mathrm{~cm}\) from left end.
Step-by-step Solution
Detailed explanation
At null condition, \(\frac{\mathrm{R}_1}{\mathrm{R}_2}=\frac{\mathrm{X}}{100-\mathrm{X}}\)
This condition is independent of the crosssectional area of the wire used.
\(\therefore \quad\) The null point will remain the same. (i.e., \(l \mathrm{~cm}\) from left end)
This condition is independent of the crosssectional area of the wire used.
\(\therefore \quad\) The null point will remain the same. (i.e., \(l \mathrm{~cm}\) from left end)
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