SSC JE Electrical Engineering 2017 Set 2 Paper

Question : 105 of 200

Marks: +1, -0

In the circuit shown below, how will the voltage

V_1

and

V_2

change when the switch 'S' is closed.

Solution:

When switch is open

V _1=V/(R_1+R_2)R_1...(1)

V _2=V/(R_1+R_2)R_2...(2)

Switch is closed.

Let

R_3 = R_1

V_2=V/(R_1/2+R_2)R_2

...(4)

V_1={V×R_1/2}/(R_1/2+R_2)

...(3)
For comparing eq. (1) and (3) and (2) and (4) voltage

V_1

decrease and

V_2

increase

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