1
JEE Main 2020 (Online) 6th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Two identical electric point dipoles have dipole moments $${\overrightarrow p _1} = p\widehat i$$ and $${\overrightarrow p _2} = - p\widehat i$$ and are held on the x axis at distance '$$a$$' from each other. When released, they move along the x-axis with the direction of their dipole moments remaining unchanged. If the mass of each dipole is 'm', their speed when they are infinitely far apart is :
A
$${p \over a}\sqrt {{3 \over {2\pi { \in _0}ma}}} $$
B
$${p \over a}\sqrt {{1 \over {\pi { \in _0}ma}}} $$
C
$${p \over a}\sqrt {{1 \over {2\pi { \in _0}ma}}} $$
D
$${p \over a}\sqrt {{2 \over {\pi { \in _0}ma}}} $$
2
JEE Main 2020 (Online) 6th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A student measuring the diameter of a pencil of circular cross-section with the help of a vernier scale records the following four readings 5.50 mm, 5.55 mm, 5.45 mm, 5.65 mm. The average of these four readings is 5.5375 mm and the standard deviation of the data is 0.07395 mm. The average diameter
of the pencil should therefore be recorded as :
A
(5.54 $$ \pm $$ 0.07) mm
B
(5.5375 $$ \pm $$ 0.0740) mm
C
(5.5375 $$ \pm $$ 0.0739) mm
D
(5.538 $$ \pm $$ 0.074) mm
3
JEE Main 2020 (Online) 6th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
In the figure shown, the current in the 10 V battery is close to : JEE Main 2020 (Online) 6th September Evening Slot Physics - Current Electricity Question 189 English
A
0.36 A from negative to positive terminal
B
0.42 A from positive to negative terminal
C
0.71 A from positive to negative terminal
D
0.21 A from positive to negative terminal
4
JEE Main 2020 (Online) 6th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Consider the force F on a charge 'q' due to a uniformly charged spherical shell of radius R carrying charge Q distributed uniformly over it. Which one of the following statements is true for F, if 'q' is placed at distance r from the centre of the shell?
A
$${1 \over {4\pi {\varepsilon _0}}}{{qQ} \over {{R^2}}} > F > 0$$ for r < R
B
$$F = {1 \over {4\pi {\varepsilon _0}}}{{qQ} \over {{r^2}}}$$ for r > R
C
$$F = {1 \over {4\pi {\varepsilon _0}}}{{qQ} \over {{r^2}}}$$ for all r
D
$$F = {1 \over {4\pi {\varepsilon _0}}}{{qQ} \over {{R^2}}}$$ for r < R
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