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Q. No.A Wheatstone bridge is used to determine the value of unknown resistance \(\mathrm{X}\) by adjusting the variable resistance \(\mathrm{Y}\) as shown in the figure. For the most precise measurement of \(\mathrm{X}\), the resistances \(\mathrm{P}\) and \(\mathrm{Q}\):
| 1. | do not play any significant role. |
| 2. | should be approximately equal to \(2\mathrm{X}\). |
| 3. | should be approximately equal and are small. |
| 4. | should be very large and unequal. |
Subtopic: Â Wheatstone Bridge |
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In the Wheatstone Bridge arrangement shown, the resistance \(P\) is \(2~ \Omega.\) The bridge is initially balanced. If P and Q are interchanged: an amount equal to \(S\) has to be added to \(R\) to restore the balance. The resistance \(Q\) equals (nearly):
1. \(2 ~\Omega\)
2. \(3.2 ~\Omega\)
3. \(4 ~\Omega\)
4. \(6.4 ~\Omega\)
1. \(2 ~\Omega\)
2. \(3.2 ~\Omega\)
3. \(4 ~\Omega\)
4. \(6.4 ~\Omega\)
Subtopic: Â Wheatstone Bridge |
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In a Wheatstone Bridge arrangement, as shown in the figure, the bridge is balanced. However, when the resistances in the arms P, Q are switched, the bridge is balanced only when \(R\) is replaced by \(4R\) in the other two arms. If the value of R is \(100\) \(\Omega\), that of S is:
1. \(100\) \(\Omega\)
2. \(50\) \(\Omega\)
3. \(200\) \(\Omega\)
4. \(400\) \(\Omega\)
1. \(100\) \(\Omega\)
2. \(50\) \(\Omega\)
3. \(200\) \(\Omega\)
4. \(400\) \(\Omega\)
Subtopic: Â Wheatstone Bridge |
 54%
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