4. The circuit shown is called the Wheatstone bridge. It is used to find the value of an unknown resistor R4 by comparison with the 3 known resistors R1, R2, and R, that can be varied. These resistors are varied until the current in the galvanometer G is 0; the bridge is then balanced and the voltage between points C and D is 0; then 13-11 and 14-12. (a) In terms of voltage V and resistors, find 12. (b) Find the relation between the four resistors. (c) Find the equivalent resistance R of the circuit. R₂ R₂
4. The circuit shown is called the Wheatstone bridge. It is used to find the value of an unknown resistor R4 by comparison with the 3 known resistors R1, R2, and R, that can be varied. These resistors are varied until the current in the galvanometer G is 0; the bridge is then balanced and the voltage between points C and D is 0; then 13-11 and 14-12. (a) In terms of voltage V and resistors, find 12. (b) Find the relation between the four resistors. (c) Find the equivalent resistance R of the circuit. R₂ R₂
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unknown resistor R4 by comparison with the 3 known resistors R₁, R2, and R, that can be
varied. These resistors are varied until the current in the galvanometer G is 0; the bridge is
then balanced and the voltage between points C and D is 0; then I-I, and 1=12. (a) In
terms of voltage V and resistors, find 72. (b) Find the relation between the four resistors. (c)
Find the equivalent resistance R of the circuit.
Rs
R₂"
Transcribed Image Text:4. The circuit shown is called the Wheatstone bridge. It is used to find the value of an
unknown resistor R4 by comparison with the 3 known resistors R₁, R2, and R, that can be
varied. These resistors are varied until the current in the galvanometer G is 0; the bridge is
then balanced and the voltage between points C and D is 0; then I-I, and 1=12. (a) In
terms of voltage V and resistors, find 72. (b) Find the relation between the four resistors. (c)
Find the equivalent resistance R of the circuit.
Rs
R₂
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