Q.

In the balanced condition, the values of the resistances of the four arms of a Wheatstone bridge are shown in the figure below. The resistance R3 has temperature coefficient 0.0004 ℃−1. If the temperature of R3 is increased by 100 ℃, the voltage developed between S and T will be ______volt.

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answer is 0.27.

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Detailed Solution

R3′=300(1+αΔT)=312ΩNowI1=50372 and I2=50600So, VS−VT=312I1−500I2=41.94−41.67=0.27V
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In the balanced condition, the values of the resistances of the four arms of a Wheatstone bridge are shown in the figure below. The resistance R3 has temperature coefficient 0.0004 ℃−1. If the temperature of R3 is increased by 100 ℃, the voltage developed between S and T will be ______volt.