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The radii of the two columns is U-tube are \( r_{1} \), and \( r_{2}\left(r_{1}\right) \). When a liquid of density \( \rho \) (angle of contact is \( 0^{\circ} \) ) is filled in it, the level difference of liquid in two arms is \( h \). The surface tension of liquid is ( \( g= \) acceleration due to gravity)
(a) \( \frac{\rho g h r_{1} r_{2}}{2\left(r_{2}-r_{1}\right)} \)
(b) \( \frac{\rho g h\left(r_{2}-r_{1}\right)}{2 r_{1} r_{2}} \)
(c) \( \frac{2\left(r_{2}-r_{1}\right)}{\rho g h r_{1} r_{2}} \)
(d) \( \frac{\rho g h}{2\left(r_{2}-r_{1}\right)} \)
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