a seat of emf is in sequence with a resistor r1


A seat of EMF is in sequence with a resistor R1 and with a parallel combination of two other resistors R2 and R3. R2 is a changeable resistor whose resistance can be changed just by turning a knob. As the knob is turned to raise the resistance of R2 what happens to the voltage across R3?

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Physics: a seat of emf is in sequence with a resistor r1
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