1
JEE Main 2020 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
In LC circuit the inductance L = 40 mH and
capacitance C = 100 $$\mu $$F. If a voltage
V(t) = 10sin(314t) is applied to the circuit, the
current in the circuit is given as :
A
0.52 cos 314 t
B
5.2 cos 314 t
C
0.52 sin 314 t
D
10 cos 314 t
2
JEE Main 2020 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The current i in the network is : JEE Main 2020 (Online) 9th January Evening Slot Physics - Semiconductor Question 133 English
A
0.6 A
B
0.3 A
C
0 A
D
0.2 A
3
JEE Main 2020 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A small circular loop of conducting wire has radius a and carries current I. It is placed in a uniform magnetic field B perpendicular to its plane such that when rotated slightly about its diameter and released, it starts performing simple harmonic motion of time period T. If the mass of the loop is m then :
A
$$T = \sqrt {{{2m} \over {IB}}} $$
B
$$T = \sqrt {{{\pi m} \over {IB}}} $$
C
$$T = \sqrt {{{\pi m} \over {2IB}}} $$
D
$$T = \sqrt {{{2\pi m} \over {IB}}} $$
4
JEE Main 2020 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A small spherical droplet of density d is floating exactly half immersed in a liquid of density $$\rho $$ and surface tension T. The radius of the droplet is (take note that the surface tension applies an upward force on the droplet) :
A
$$r = \sqrt {{T \over {\left( {d - \rho } \right)g}}} $$
B
$$r = \sqrt {{{2T} \over {3\left( {d + \rho } \right)g}}} $$
C
$$r = \sqrt {{T \over {\left( {d + \rho } \right)g}}} $$
D
$$r = \sqrt {{{3T} \over {\left( {2d - \rho } \right)g}}} $$
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