1
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 145 English
A
$$420N/C$$
B
$$480N/C$$
C
$$240N/C$$
D
$$360N/C$$
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 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
$$2$$ $$s$$
4
JEE Main 2016 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
A particle performs simple harmonic motion with amplitude $$A.$$ Its speed is trebled at the instant that it is at a distance $${{2A} \over 3}$$ from equilibrium position. The new amplitude of the motion is:
A
$$A\sqrt 3 $$
B
$${{7A} \over 3}$$
C
$${A \over 3}\sqrt {41} $$
D
$$3A$$
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