Problem 1: Two point charges are placed inside a spherical Gaussian surface. The
ID: 1863725 • Letter: P
Question
Problem 1: Two point charges are placed inside a spherical Gaussian surface. The total electric flux ? through a closed surface is changed if O: the sphere is replaced by a smaller sphere with both charges still in the sphere. 0: onee point charge is moved off center and now outside the original sphere. : the second point charge is placed somewhere else inside the sphere. O: the sphere is replaced by a cube of same volume with both point charge still inside the cub Problem 2 The electric potential at a certain distance from a point charge can be represented by V. What is the value of the electric potential at four times the distance from the point charge? D: V/4 0: 4.V Problem 3: Which of the following statements is true? O: An equipotential surface is a three-dimensional surface on which the electric potential is always zero at every point. O: Electric field lines and equipotential surfaces are always parallel. 0: The potential energy of a test charge decreases as it moves along an equipotential surface. O: When all charges are at rest, the surface of a conductor is always an equipotential surface.Explanation / Answer
Problem (1) -
Second option is the correct answer
Explanation -
Total flux depends on the total charge inside an enclosed surface. In the rest three options, total enclosed charged remains the same. Only in second option, total charged inside the surface changed.
Problem - 2 -
Third option V/4 is the correct answer.
Explanation -
Electric potential is inversely proportional to the distance of the charge from a certain point. So, when distance increases 4 - times, the potential will decrease by (1/4) times.
problem 3 -
Last option 'when all charges are at rest, the surface of a conductor is always an equipotential surface' is the correct answer.
Explanation -
First option is not appropriate. Equipotential means, same potential and not the zero potential.
Elelectric field lines and equipotential surface are always perpendicular.
Third is also incorrect.