$A$ stationary charge produces . . . . . . .

$A$ capacitor of capacity $4 \mu F$ is charged to $80 \ V$ and another capacitor of capacity $6 \mu F$ is charged to $30 \ V$. When they are connected,the energy lost by the $4 \mu F$ capacitor is: (in $mJ$)

If the line $ax + by + c = 0$ is a normal to the curve $xy = 1$,then

Which of the following is responsible for Alzheimer's disease in humans?

If $\int \frac{\sin x}{\cos x(1+\cos x)} d x=f(x)+c$,then $f(x)$ is equal to

Blister copper is