different mcq questios on electrostatyics
Answers
Answer:
Explanation:
1. Question4 points
An electric dipole is placed at an angle of 30° with an electric field intensity 2 × 105 N/C. It experiences a torque equal to 4 N m. The charge on the dipole, if the dipole length is 2 cm, is [NEET 2016]
(A) 8 mC
(B) 2 mC
(C) 5 mC
(D) 7 μC
2. Question4 points
A combination of capacitors is set up as shown in the figure. The magnitude of the electric field, due to a point charge Q (having a charge equal to the sum of the charges on the 4 μF and 9 μF capacitors), at a point distant 30 m from it, would equal : [JEE Main 2016]
(A) 360 N/C
(B) 420 N/C
(C) 480 N/C
(D) 240 N/C
3. Question4 points
A, B and C are three points in a uniform electric field. The electric potential is [NEET 2013]
(A) Maximum at A
(B) Maximum at B
(C) Maximum at C
(D) Same at all the three points A, B and C
4. Question4 points
Three concentric metallic spherical shells of radii R, 2R, 3R, are given charges Q1, Q2, Q3, respectively. It is found that the surface charge densities on the outer surfaces of the shells are equal. Then, the ratio of the charges given to the shells, Q1 : Q2 : Q3, is [IIT JEE 2009]
(A) 1 : 2 : 3
(B) 1 : 3 : 5
(C) 1 : 4 : 9
(D) 1 : 8 : 18
5. Question4 points
Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle of 30° with each other. When suspended in a liquid of density 0.8 g cm–3, the angle remains the same. If density of the material of the sphere is 1.6 g cm–3, the dielectric constant of the liquid is [AIEEE 2010]
(A) 1
(B) 4
(C) 3
(D) 2