IIT-JEE Exam

A cylindrical cavity of diameter a exists inside a cylinder of diameter 2a //Both the cylinder
and the cavity are infinitely long. A uniform current density J flows along the length. If the magnitude of the
magnetic field at the point P is given by N/12 MICRO aJ, then the value of N is

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IIT-JEE Other Question

A lamina is made by removing a small disc of diameter 2R froma bigger disc of uniform mass density and radius
2R, as shown in the figure. The moment of inertia of this lamina about axes passing through O and P is IO and
IP, respectively. Both these axes are perpendicular to the plane of the lamina. The ratio
Ip/Io
to the nearest integer
is : Which ordering of compounds is according to the decreasing order of the oxidation state of nitrogen?
(A) HNO3, NO, NH4Cl, N2 (B) HNO3, NO, N2, NH4Cl
(C) HNO3, NH4Cl, NO, N2 (D) NO, HNO3, NH4Cl, N2