A fixed resistor is cannected 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
If the resistance of the variable resistor is decreased slightly, the rate at which energy is transferred to the variable resistor

Options

A. increases
B. decreases
C. remains the same
D. cannot be determined without more information

Answer

A

Explanation

Rate of energy `=power=I_(2)^(2)R_(V)`

`I_(2)((epsilon)/(r+ (R R_(V))/(R+R_(V))))(R)/(R+R_(V))=(epsilon)/(r+R_(V)(1+(r)/(R)))`
so , `(P_(2))_(max)` is when, `R_(V)=((rR)/(r+R)) lt R`