Two coils having self-inductances $\mathrm{L}_1=75 \mathrm{mH}$ and $L_2=48 \mathrm{mH}$ are coupled with each other. If the mutual inductance of the coils is 37.2 mH , then coefficient of coupling will be
0.58
0.60
0.62
0.64
When a big drop of water is formed from n small drops of water, the energy loss is 4 E , where E is the energy of the bigger drop. If $R$ and $r$ is the radius of the bigger and the smaller drop respectively then number of smaller drops $n$ is
$\frac{5 R^2}{r^2}$
$\frac{2 R^2}{r}$
$\frac{5 R}{r}$
$\frac{5 R^2}{r}$
Monochromatic light of wavelength $4800 \mathop {\rm{A}}\limits^{\rm{o}}$ falls on slit of width ' $a$ '. For what value of ' $a$ ', the first maximum falls at $30^{\circ} .\left(\sin 30^{\circ}=0.5\right)$
$14200 \mathop {\rm{A}}\limits^{\rm{o}}$
$14400 \mathop {\rm{A}}\limits^{\rm{o}}$
$14600 \mathop {\rm{A}}\limits^{\rm{o}}$
$15000 \mathop {\rm{A}}\limits^{\rm{o}}$
A bucket filled with water is revolved in a vertical circle of radius 10 m and water just not fall down. The time period of revolution will be (acceleration due to gravity $=10 \mathrm{~m} / \mathrm{s}^2$ )
$\pi \mathrm{s}$
$2 \pi \mathrm{~s}$
$10 \pi \mathrm{~s}$
$20 \pi \mathrm{~s}$
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