1
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
$$\sqrt {\left( {{{{R_1}} \over {{R_2}}}} \right)}$$
2
NEET 2021
+4
-1
Column - I gives certain physical terms associated with flow of current through a metallic conductor. Column-II gives some mathematical relations involving electrical quantities. Match column-I and column-II with appropriate relations.

Column - I Column - II
(A) Drift Velocity (P) $${m \over {n{e^2}p}}$$
(B) Electrical Resistivity (Q) $$ne{\upsilon _d}$$
(C) Relaxation Period (R) $${{eE} \over m}\tau$$
(D) Current Density (S) $${E \over J}$$
A
(A)-(R); (B)-(Q); (C)-(S); (D)-(P)
B
(A)-(R); (B)-(S); (C)-(P); (D)-(Q)
C
(A)-(R); (B)-(S); (C)-(Q); (D)-(P)
D
(A)-(R); (B)-(P); (C)-(S); (D)-(Q)
3
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
4
NEET 2020 Phase 1
+4
-1
A short electric dipole has a dipole moment of 16 $$\times$$ 10-9 Cm. The electric potential due to the dipole at a point at a distance of 0.6 m from the centre of the dipole, situated on a line making an angle of $$60^\circ$$ with the dipole axis is :

$$\left( {{1 \over {4\pi {\varepsilon _0}}} = 9 \times {{10}^9}N{m^2}/{C^2}} \right)$$
A
200 V
B
400 V
C
zero
D
50 V
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