question_answer

A voltmeter of resistance \[280\,\,\Omega \] reads the voltage across the terminals of an old dry cell to be 1.40 V, while a potentiometer reads its voltage equal to 1.55 V. To draw maximum power from the battery, the load resistance must have the value

A)  \[60\,\,\Omega \]                          

B)  \[45\,\,\Omega \]

C)  \[35\,\,\Omega \]                          

D)  \[30\,\,\Omega \]