The plant part which consists of two generations,one within the other,is:

If the charge on the capacitor is increased by $2 \ C$,the energy stored in it increases by $21 \%$. The original charge on the capacitor is: (in $C$)

The reading of the ammeter in the circuit shown will be: (in $A$)

$\cos A \cos 2 A \cos 4 A \ldots \cos 2^{n-1} A$ equals

What do athletes misuse to increase muscle strength?

Wavelengths of light used in an optical instrument are $\lambda_1 = 4000 \ Å$ and $\lambda_2 = 5000 \ Å$. The ratio of their respective resolving powers (corresponding to $\lambda_1$ and $\lambda_2$) is: