JEE Main 2017 (2 Apr, offline) Physics Q9: Thermal Expansion

Question

An external pressure P is applied on a cube at 0°C so that it is equally compressed from all sides. K is the bulk modulus of the material of the cube and

\alpha

is its coefficient of linear expansion. Suppose we want to bring the cube to its original size by heating. The temperature should be raised by :

(1) $\frac{P}{3\alpha K}$ Official answer
(2) $\frac{P}{\alpha K}$
(3) $\frac{3\alpha}{PK}$
(4) $3PK\alpha$

Official answer

Option 1

CBSE answer key (25/04/2017, used for result).

Accepted Answer

Option 1: $\frac{P}{3\alpha K}$

Answer

$\frac{P}{3\alpha K}$

Answer

$\frac{P}{\alpha K}$

Answer

$\frac{3\alpha}{PK}$

Answer

$3PK\alpha$

JEE Main 2 April 2017 (offline), Physics Q9

Same idea in other shifts