Question: Problem 1 : B - 6 - 3 1 . When the switch is open current flows through 6 0 and 1 0 0 Ohms

Problem

1

: B

- 6 - 3 1 .

When the switch is open current flows through

60

and

100

Ohms resistors. According Kirchhoff

s voltage law the sum of the voltage drops on these resistors must be equal to the input voltage E

2 .

When the switch is closed, the current flowing through

60

Ohms resistor will split through the two resistors

100

and R Ohms.

3 .

Potential drop at

100

and R Ohms resistors must be equal since between the junction they split and the junction they join again the potential drop must be equal. The final answer is R

= 25

Ohms

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