JEE Main 2022 — Physics Mechanics
A steel wire of length 3.2m(YS=2.0×1011Nm−2) and a copper wire of length 4.4m(YC=1.1×1011Nm−2) , both of radius 1.4mm are connected end to end. When stretched by a load, the net elongation is found to be 1.4mm. The load applied, in Newton, will be: (Given π=722)
Held on 27 Jul 2022 · Verified 6 Jul 2026.
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If $\epsilon, E$ and $t$ represent the free space permittivity, electric field and time respectively, then the unit of $\frac{\epsilon E}{t}$ will be :
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Suppose there is a uniform circular disc of mass $M \mathrm{~kg}$ and radius $r \mathrm{~m}$ shown in figure. The shaded regions are cut out from the disc. The moment of inertia of the remainder about the axis $A$ of the disc is given by $\frac{x}{256} M r^{2}$. The value of $x$ is $\_\_\_\_$. 
A soap bubble of surface tension $0.04 \mathrm{~N} / \mathrm{m}$ is blown to a diameter of 7 cm. If $(15000-x) \mu \mathrm{J}$ of work is done in blowing it further to make its diameter 14 cm, then the value of $x$ is $\_\_\_\_$. ($\pi=22 / 7$)
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