Let $c_1: x^2+y^2=1$ and $c_2:(x-10)^2+y^2=9$ be two circles a line touching $c_1$ at $P$ and $c_2$ at $Q$. If $M$ is the mid-point of $P Q$, then $M$ lies on a circle $(x-5)^2+y^2=r^2$ where ' $r$ ' is $(r>0)$
$\sqrt{3}$
$3 / 2$
2
3
$S_n=1 \cdot 3+2 \cdot 2^2+3 \cdot 3^3+4 \cdot 2^4+\ldots \ldots \ldots$ upto $n$ terms. If $S_{20}=a \cdot 3^{21}+b \cdot 2^{22}+\frac{391}{288}$, then value of $32 a-9 b$ is
21
13
17
29
Three electric bulbs of 200 W and 400 W are shown in figure. The resultant power of the combination, if rated voltage is applied across the combination is

800 W
400 W
200 W
600 W
In hydrogen atom, an electron is revolving in the orbit of radius $0.53 \mathop {\rm{A}}\limits^{\rm{o}} $ with $6.6 \times 10^{15} \mathrm{rps}$. Magnetic field produced at the centre of the orbit is
$0.125 \mathrm{~Wb} / \mathrm{m}^2$
$1.25 \mathrm{~Wb} / \mathrm{m}^2$
$12.5 \mathrm{~Wb} / \mathrm{m}^2$
$125 \mathrm{~Wb} / \mathrm{m}^2$
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