1
NEET 2021
+4
-1
Polar molecules are the molecules :
A
having a permanent electric dipole moment
B
having zero dipole moment
C
acquire a dipole moment only in the presence of electric field due to displacement of charges
D
acquire a dipole moment only when magnetic field is absent
2
NEET 2021
+4
-1
A dipole is placed in an electric field as shown. In which direction will it move?

A
towards the right as its potential energy will increase.
B
towards the left as its potential energy will increase.
C
towards the right as its potential energy will decrease.
D
towards the left as its potential energy will decrease.
3
NEET 2021
+4
-1
Two charged spherical conductors of radius R1 and R2 are connected by a wire. Then the ratio of surface charge densities of the spheres ($$\sigma$$1 / $$\sigma$$2) is :
A
$${{R_1^2} \over {R_2^2}}$$
B
$${{R_1^{}} \over {R_2^{}}}$$
C
$${{R_2^{}} \over {R_1^{}}}$$
D
$$\sqrt {\left( {{{{R_1}} \over {{R_2}}}} \right)}$$
4
NEET 2021
+4
-1
Twenty seven drops of same size are charged at 220V each. They combine to form a bigger drop. Calculate the potential of the bigger drop.
A
1980 V
B
660 V
C
1320 V
D
1520 V
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