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Physics Guru is an online education and competitive examinations preparation portal founded by Manish Verma, an IIT Madras alumnus, providing learning resources for competitive examinations.

The emphasis is on conceptual understanding, analytical thinking and problem solving rather than simply memorising formulas and standard methods.

The objective is to help students understand what they are learning and develop the ability to solve problems they have not seen before.

If the conductivity of mercury at $0^\circ C $ is ....

If the conductivity of mercury at $0^\circ C $ is $1.07 \times 10^6 Sm^{-1} $ and the resistance of a cell containing mercury is $0.243 \Omega $, then the cell constant of the cell is $x \times 10^4 m^{-1} $. (Nearest integer)

Solution

$R=\frac {K_{cell}}{\kappa }$

Or, $K_{cell} = 0.243 \times 1.07 \times 10^6 \approx 26 \times 10^4 m^{-1} $

Answer: 26