question_answer

A battery of internal resistance \[2\Omega \] is connected to a variable resistor whose value can vary from \[4\Omega \] to \[10\Omega \,.\] The resistance is initially set at\[4\Omega \,\,.\] If the resistance is now increased then -

A) Power consumed by it will decrease

B) Power consumed by it will increases

C) Power consumed by it may increase or may decrease

D) Power consumed will first increase then decreases

Correct Answer: A

Solution :

[A] Power maximum when \[r=R.\] So, Power consumed by it will decease for \[R>r.\]