1
JEE Main 2016 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
A uniform string of length $$20$$ $$m$$ is suspended from a rigid support. A short wave pulse is introduced at its lowest end. It starts moving up the string. The time taken to reach the supports is :
(take $${\,\,g = 10m{s^{ - 2}}}$$ )
A
$$2\sqrt 2 s$$
B
$$2\pi \sqrt 2 s$$
C
$$2\pi \sqrt 2 s$$
D
$$2$$ $$s$$
2
JEE Main 2016 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
A pipe open at both ends has a fundamental frequency $$f$$ in air. The pipe is dipped vertically in water so that half of it is in water. The fundamental frequency of the air column is now :
A
$$2f$$
B
$$f$$
C
$${f \over 2}$$
D
$${3f \over 4}$$
3
JEE Main 2016 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
A combination of capacitors is set up as shown in the figure. The magnitude of the electric field, due to a point charge $$Q$$ (having a charge equal to the sum of the charges on the $$4$$ $$\mu \,F$$ and $$9$$ $$\mu \,F$$ capacitors), at a point distance $$30$$ $$m$$ from it, would equal :

JEE Main 2016 (Offline) Physics - Capacitor Question 123 English
A
$$420N/C$$
B
$$480N/C$$
C
$$240N/C$$
D
$$360N/C$$
4
JEE Main 2016 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
The region between two concentric spheres of radii $$'a'$$ and $$'b',$$ respectively (see figure), have volume charge density $$\rho = {A \over r},$$ where $$A$$ is a constant and $$r$$ is the distance from the center. A such that the electric field in the region between the spheres will be constant, is :

JEE Main 2016 (Offline) Physics - Electrostatics Question 167 English
A
$${{2Q} \over {\pi \left( {{a^2} - {b^2}} \right)}}$$
B
$${{2Q} \over {\pi \,{a^2}}}$$
C
$${Q \over {2\pi \,{a^2}}}$$
D
$${Q \over {2\pi \,\left( {{b^2} - {a^2}} \right)}}$$
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