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
$5: 2$
$2: 5$
$7: 2$
$3: 2$
An object is placed at an unknown distance from a convex objective lens of focal length 5 cm . The objective lens forms a real image which acts as an object for a convex eyepiece of focal length 6.25 cm . The distance between the objective and eyepiece is 20 cm . The microscope is adjusted so that the final image is formed at the least distance of distinct vision $(25 \mathrm{~cm})$. Which of the following is correct?
A. Object distance $=7.5 \mathrm{~cm}$; Total magnification $=10$
B. Object distance = 10 cm ; Total magnification = 20
C. Object distance $=5 \mathrm{~cm}$; Total magnification $=20$
D. Object distance = 2.5 cm ; Total magnification = 10
C
D
B
A
From the same point, two stones A and B are thrown simultaneously, A is thrown up vertically with a velocity of $10 \mathrm{~ms}^{-1}$ and $B$ is thrown up with the same velocity at $30^{\circ}$ with the horizontal. The separation between the balls at 2 s is
25 m
10.5 m
22 m
20 m
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