1
JEE Main 2020 (Online) 6th September Evening Slot
+4
-1
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
+4
-1
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
3
JEE Main 2020 (Online) 6th September Morning Slot
+4
-1
Charges Q1 and Q2 are at points A and B of a right angle triangle OAB (see figure). The resultant electric field at point O is perpendicular to the hypotenuse, then
$${{{Q_1}} \over {{Q_2}}}$$ is proportional to :
A
$${{x_1^3} \over {x_2^3}}$$
B
$${{x_2^2} \over {x_1^2}}$$
C
$${{{x_1}} \over {{x_2}}}$$
D
$${{{x_2}} \over {{x_1}}}$$
4
JEE Main 2020 (Online) 5th September Evening Slot
+4
-1
Ten charges are placed on the circumference of a circle of radius R with constant angular separation between successive charges. Alternate charges 1, 3, 5, 7, 9 have charge (+q) each, while 2, 4, 6, 8, 10 have charge (–q) each. The potential V and the electric field E at the centre of the circle are respectively.
(Take V = 0 at infinity)
A
V = 0; E = 0
B
$$V = {{10q} \over {4\pi {\varepsilon _0}R}}$$; $$E = {{10q} \over {4\pi {\varepsilon _0}{R^2}}}$$
C
$$V = {{10q} \over {4\pi {\varepsilon _0}R}}$$; E = 0
D
V = 0; $$E = {{10q} \over {4\pi {\varepsilon _0}{R^2}}}$$
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