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

A charge of 0.8 C is divided into two charges Q$$_1$$ and Q$$_2$$. These are kept at a separation of 30 cm. The force on Q$$_1$$ is maximum when

A
$$Q_1=Q_2=0.4$$ C
B
$$Q_1 \approx 0.8$$ C, $$Q_2$$ negligible
C
$$Q_1$$ negligible, $$Q_2 \approx 0.8$$ C
D
$$Q_1=0.2$$ C, $$Q_2=0.6$$ C
2
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
3
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
$$\frac{\pi}{2}$$
4
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
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