1
COMEDK 2021
+1
-0

What is the electric field near infinite plane sheet of charge density $$\sigma$$ ?

A
$${\sigma \over {2{\varepsilon _0}}}$$
B
$${{\sigma A} \over {2{\varepsilon _0}}}$$
C
$${\sigma \over {2{\varepsilon _0}A}}$$
D
$${\sigma \over {{\varepsilon _0}}}$$
2
COMEDK 2020
+1
-0

Consider a thin spherical shell of radius R consisting of uniform surface charge density s. The electric field at a point of distance x from its centre and outside the shell is

A
inversely proportional to $$s$$
B
directly proportional to $$x^2$$
C
directly proportional to $$R$$
D
inversely proportional to $$x^2$$
3
COMEDK 2020
+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
4
COMEDK 2020
+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
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