A car of mass 500 kg is lifted by a hydraulic jack that consist of two pistons. If the diameter of large and small pistons are 2 m and 20 cm , respectively. Then force required (in N ) to lift the car by smaller piston is (take, $g=10 \mathrm{~m} / \mathrm{s}^2$ )
10
30
50
40
A network of four capacitors of capacity equal to $C_1=C, C_2=2 C, C_3=3 C$ and $C_4=4 C$ are connected to a battery, as shown in the figure. The ratio of the charges on $C_2$ and $C_4$ is $\_\_\_\_$

$22 / 3$
$3 / 22$
$7 / 4$
$4 / 7$
Capacity of a parallel plate capacitor in the absence of dielectric medium is $C_0$. A sheet of dielectric constant $k$ and thickness of one-fourth of the plate separation is inserted between the plates. If the new capacity is $C$, then $\frac{C}{C_0}$ is
$\frac{3 k+1}{2 k}$
$\frac{3 k+1}{4 k}$
$\frac{2 k}{3 k+1}$
$\frac{4 k}{3 k+1}$
Which of the following statement is correct regarding the AC circuit shown in the adjacent figure?

The rms value of current through the circuit is $i_{\text {rms }}=5 \sqrt{2} \mathrm{~A}$
The phase difference between source emf and current is $\phi=\cos ^{-1}\left(\frac{1}{3}\right)$
Average power dissipated in the circuit is 500 W
None of the above
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