The resistors in this circuit are identical. A current I o flows through the fir

Question

The resistors in this circuit are identical. A current Io flows through the first resistor when the switch (sw) is open, as shown here. Remember that no current will flow through an open switch (which has infinite resistance), and that the resistance of an ideal wire is zero.

(1) When the switch is closed ("shorting" out the second resistor)

a) no current flows through the wire with the switch.

OR

b) no current flows through the second resistor.

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(2)When the switch is closed the current through the first resistor will be

a) 2Io

b) Io/2   

c) zero

d) Io

Explanation / Answer

1) when switch is closedthen no current flows through the second resistor (b) .since all the current passes through the branch of the circuit parallel to the resistance.

2) when switch is closed then second resistor will shorted out.so resistance of the circuit decreases.so from( I= V/R)

current increases.If I0 is the initial current flowing from the circuit then 2*I0 current will flow from first resistor.

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