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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