1
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

An electric dipole has a pair of equal and opposite point charges $$q$$ and $$-q$$ separated by a distance $$2x$$. The axis of the dipole is defined as

A
direction from positive charge to negative charge
B
direction from negative charge to positive charge
C
perpendicular to the line joining the two charges drawn at the centre and pointing upward direction
D
perpendicular to the line joining the two charges at the centre and pointing downward direction
2
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

An electric dipole is placed in a uniform electric field with the dipole axis making an angle $$\theta$$ with the direction of the electric field. The orientation of the dipole for stable equilibrium is

A
$$\frac{\pi}{6}$$
B
$$\frac{\pi}{3}$$
C
0
D
$$\frac{\pi}{2}$$
3
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

Two point charges A = +3 nC and B = +1 nC are placed 5 cm apart in air. The work done to move charge B towards A by 1 cm is

A
$$2.0\times10^{-7}$$ J
B
$$1.35\times10^{-7}$$ J
C
$$2.7\times10^{-7}$$ J
D
$$12.1\times10^{-7}$$ J
4
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

The potential energies associated with four orientations of an electric dipole in an electric field are

(i) $$-5U_0$$ (ii) $$-7U_0$$ (iii) $$3U_0$$ (iv) $$5U_0$$

where $$U_0$$ is positive. Rank the orientations according to the angle between the electric dipole moment p and electric field E, greatest first

A
(i), (ii), (iii), (iv)
B
(ii), (iii), (i), (iv)
C
(iv), (iii), (i), (ii)
D
(iv), (i), (iii), (ii)
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