A conducting sphere of radius R = 20 cm is given by a charge Q = 16μC. What is E at centre?
3.6×106 N/C
1.8×106 N/C
Zero
0.9×106 N/C
Two charged spheres separated by a distance d exert some force (F) on each other. If they are immersed in a liquid of dielectric constant 4, then what is the force exerted, if all other conditions are same ?
2F
4F
In a discharge tube ionization of enclosed gas is produced due to collisions between
positive ions and neutral atoms/molecules
negative electrons and neutral atoms/molecules
photons and neutral atoms/molecules
photons and neutral atoms/molecules
Number of extra electrons in a body of charge -80C, is
80 × 1015
80 × 10−15
5 × 1014
1.28 × 10−17
The figure shows three points A, B and C in a region of a uniform electric field . The line AB is perpendicular and BC is parallel to the field lines. Then which of the following holds good?
VA = VB = VC
VA = VB > VC
VA = VB < VC
VA > VB = VC
Two spheres of radii R1 and R2 respectively are charged and joined by a wire. The ratio of the electric field of spheres is :
If an insulated non-conducting sphere of radius R has charge density ρ. The electric field at a distance r from the centre of sphere (r > R) will be
Two parallel large thin metal sheets have equal surface charge densities ( σ = 26.4 × 10-12 C/m2 ) of opposite signs. The electric field between these sheets is
1.5 N/C
1.5 × 10-10 N/C
3 N/C
3 × 10-10 N/C
The spatial distribution of the electric field due to two charges (A, B) is shown in figure. Which one of the following statements is correct?
A is +ve and +B is -ve and
A is ve and B is +ve;
both are +ve but A > B
both are ve but A > B