$\mathrm{L}, \mathrm{C}$ and R are connected in series to an a. c. source. Which one of the following is true?
Phase relation between current and voltage is such that
A bar of iron having magnetic moment $2.4 \mathrm{Am}^2$ weighs 66 g . If the density of the material of the bar is $7700 \mathrm{~kg} / \mathrm{m}^3$, the intensity of magnetisation in $\mathrm{Am}^{-1}$ is
The error in the measurement of length and mass is $3 \%$ and $4 \%$ respectively. The error in the measurement of density will be
The potentiometer wire is 5 m long and potential difference of 4 V is maintained between the ends. The e.m.f. of the cell which balances against a length of 200 cm of the potentiometer wire is
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