Two circular coils can be arranged in any of the three situations shown in the figure. Their mutual inductance will be

If $\overrightarrow{a}, \overrightarrow{b}, \overrightarrow{c}$ are three vectors such that $\overrightarrow{a}=\overrightarrow{b}+\overrightarrow{c}$ and the angle between $\overrightarrow{b}$ and $\overrightarrow{c}$ is $\frac{\pi}{2}$,then:

On addition of $1 \, mL$ of $10 \% \, NaCl$ solution to $10 \, mL$ gold sol in the presence of $0.25 \, g$ of starch,the coagulation is just prevented. The gold number of starch is:

The suspension of slaked lime in water is known as

Which one of the following has the longest covalent bond distance?

If the curves $x^2+p y^2=1$ and $q x^2+y^2=1$ are orthogonal to each other, then