(a) If the resistance R 1 decreases, what happens to the voltage drop across R 3 ?...

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(a) If the resistance R1 decreases, what happens to the voltage drop across R3? The switch S is still open, as in the figure. 

(b) If the resistance R1 decreases, what happens to the voltage drop across R2? The switch S is still open, as in the figure. 

(c) In the circuit shown, if the switch S is closed, what happens to the current through R1?

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