question_answer

A fixed resistor is in parallel with a variable resistor, both are connected to a real battery (internal resistance is not negligible). Originally the fixed and variable resistors have the same resistance. As the resistance of the variable resistor is decreased, the current through the fixed resistor

A)  increases

B)  decreases

C)  remains the same

D)  cannot be determined without more information

Correct Answer: B

Solution :

 P.D. across parallel resistances remains same, decreasing\[{{R}_{V}}\]increases \[{{I}_{2}}\] hence decreases \[{{I}_{1}}\].