1
JEE Main 2019 (Online) 10th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The graph shows how the magnification m produced by a thin lens varies with image distance v. What is the focal length of the lens used? JEE Main 2019 (Online) 10th April Evening Slot Physics - Geometrical Optics Question 138 English
A
$${{{b^2}} \over {ac}}$$
B
$${{{b^2}c} \over a}$$
C
$${a \over c}$$
D
$${b \over c}$$
2
JEE Main 2019 (Online) 10th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A simple pendulum of length L is placed between the plates of a parallel plate capacitor having electric field E, as shown in figure. Its bob has mass m and charge q. The time period of the pendulum is given by : JEE Main 2019 (Online) 10th April Evening Slot Physics - Capacitor Question 99 English
A
$$2\pi \sqrt {{L \over {\sqrt {{g^2} - {{{q^2}{E^2}} \over {{m^2}}}} }}} $$
B
$$2\pi \sqrt {{L \over {\left( {g + {{qE} \over m}} \right)}}} $$
C
$$2\pi \sqrt {{L \over {\sqrt {{g^2} + {{{q^2}{E^2}} \over {{m^2}}}} }}} $$
D
$$2\pi \sqrt {{L \over {\left( {g - {{qE} \over m}} \right)}}} $$
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