A particle starts rotating from rest. The instantaneous angular displacement is $\theta=3 t^3-t^2$, where $\theta$ is in radian and $t$ in s; The angular velocity at $t=1 \mathrm{~s}$ is
$9 \mathrm{rads}^{-1}$
$7 \mathrm{rads}^{-1}$
$3 \mathrm{rads}^{-1}$
$1 \mathrm{rads}^{-1}$
Point charge $\sqrt{2} C, \sqrt{2} C$, and $-2 C$ are placed at the three vertices of a right-angled triangle in air. [as shown in the figure below]
What is the electric field at a point $P$ on the hypotenuse that is equidistant from all three charges.
Given distances $X P=Y P=Z P=0.5 \mathrm{~m}$

$0 \cdot 72 \times 10^{10} N C^{-1} \quad$ along YP
$7.2 \times 10^{10} N C^{-1} \quad$ along PY
$0.72 \times 10^9 \mathrm{NC}^{-1} \quad$ along YP
$7.2 \times 10^9 \mathrm{NC}^{-1} \quad$ along PY
A solenoid having resistance $R=60 \Omega$ and inductance $L=0.4 \mathrm{H}$ is connected to an AC source $V=100 \sqrt{2} \sin 200 t$.
Find the maximum current.
1.732 A
2.828 A
1.414 A
0.707 A
A motor cyclist starts from the top of an inclined plane of height $h$ to go around a globe of death trap of radius $r$. The ratio of minimum height ' $h$ ' of the inclined plane to the radius ' $r$ ' of the death globe in order to go around the death globe successfully is
$5: 2$
$2: 5$
$7: 2$
$3: 2$
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