A temperature sensitive resistor (thermistor) is used in a Bridge circuit for the measurement of the temperature of a water bath as shown in the fig below. The temperature is indicated on the ammeter M, which has a sensitivity of 50microA at full-scale deflection and a resistance of 300 Ohms. A 4 V battery, of negligible internal resistance, is used to energize the bridge. The thermistor has a resistance of 1000 Ohms at a water temperature of 50 °C and its resistance decreases by 5% for each degree increase in temperature. Find the value of the resistance to which R4 must be set to give zero reading on meter M when the temperature of the bath is 50 °C. Enter your numerical value in units of Ohms. C R 1 (1000) S =4VI (M) (300) R, (750) R ₂ (Thermistor)
A temperature sensitive resistor (thermistor) is used in a Bridge circuit for the measurement of the temperature of a water bath as shown in the fig below. The temperature is indicated on the ammeter M, which has a sensitivity of 50microA at full-scale deflection and a resistance of 300 Ohms. A 4 V battery, of negligible internal resistance, is used to energize the bridge. The thermistor has a resistance of 1000 Ohms at a water temperature of 50 °C and its resistance decreases by 5% for each degree increase in temperature. Find the value of the resistance to which R4 must be set to give zero reading on meter M when the temperature of the bath is 50 °C. Enter your numerical value in units of Ohms. C R 1 (1000) S =4VI (M) (300) R, (750) R ₂ (Thermistor)
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A temperature sensitive resistor (thermistor) is used in a Bridge circuit for the measurement of the temperature of a water bath as shown in the fig below. The temperature is indicated on the ammeter M, which has a sensitivity of 50microA at full-scale deflection and a resistance of 300 Ohms. A 4 V battery, of negligible internal resistance, is used to energize the bridge. The thermistor has a resistance of
1000 Ohms at a water temperature of 50 °C
and its resistance decreases by 5% for each degree increase in temperature. Find the value of the resistance to which R4 must be set to give zero reading on meter M when the temperature of the bath is 50 °C. Enter your numerical value in units of Ohms.
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Transcribed Image Text:A temperature sensitive resistor (thermistor) is
used in a Bridge circuit for the measurement of
the temperature of a water bath as shown in
the fig below. The temperature is indicated on
the ammeter M, which has a sensitivity of
50microA at full-scale deflection and a
resistance of 300 Ohms. A 4 V battery, of
negligible internal resistance, is used to energize
the bridge. The thermistor has a resistance of
1000 Ohms at a water temperature of 50 °C
and its resistance decreases by 5% for each
degree increase in temperature. Find the value
of the resistance to which R4 must be set to
give zero reading on meter M when the
temperature of the bath is 50 °C. Enter your
numerical value in units of Ohms.
C
R
1
(1000)
S
=4VI
(M)
(300)
R,
(750)
R ₂
(Thermistor)
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