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The half-life of radioactive Polonium (Po) is 138.6 days. For ten lakh Polonium atoms, the number of disintegrations in 24 hours is
|
(a) 2000 |
(b) 3000 |
(c) 4000 |
(d) 5000 |
A convex lens of ______ focal length gives a greater magnification than lenses of _______ focal length.
When a glass rod is rubbed with silk, it
|
(a) Gains electrons from silk |
(b) Gives electrons to silk |
|
(c) Gains protons from silk |
(d) Gives protons to silk |
According to Gauss’ Theorem, electric field of an infinitely long straight wire is proportional to
|
(a) r |
(b) |
(c) |
(d) |
Two concentric coplanar circular loops of radii
and
carry currents of respectively
and
in opposite directions (one clockwise and the other anticlockwise.) The magnetic induction at the centre of the loops is half that due to
alone at the centre. If
. the value of
is
|
(a) 2 |
(b) 1/2 |
(c) 1/4 |
(d) 1 |
