## Electrostatics and Capacitance Quiz-5

As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background.

Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced.

Q41. A positive point charge q is carried from a point B to a point A in the electric field of a point charge +Q at O. If the permittivity of free space is Îµ0, the work done in the process is given by (where a =OA and b=OR)
•

•

•

•

Solution

Q42.Two parallel plates of area A are separated by two different dielectric as shown in figure. The net capacitance is

•  (Îµ0 A)/2d
•  (Îµ0 A)/d
•  (3Îµ0 A)/d
•  (4Îµ0 A)/3d
Solution

Q43.  In the following diagram the work done in moving a point charge from point P to point A, B and C is respectively as WA,WB and WC then

•  WA=WB=WC
•   WA=WB=WC=0
•  WA>WB>WC
•  WA<WB<WC
Solution
When a positive charge is moved from one point to another in an electric of magnetic field, then under the influence of the field force acts on the particle and an external agent will have to do work against this force. But in the given case the charge moves under influence of no field, hence it does not experience any force therefore, no work is done. WA=WB=WC=0

Q44. A parallel plate capacitor of capacitance 100 pF is to be constructed by using paper sheets of 1 mm thickness as dielectric. If the dielectric constant of paper is 4, the number of circular metal foils of diameter 2 cm each required for the purpose is
•  40
•  20
•  30
•  10
Solution

Q45.Identify the wrong statement.
•  The electrical potential energy of a system of two protons shall increase if the separation between the two is decreased.
•  The electrical potential energy of a proton-electron system will increase if the separation between the two is decreased.
•  The electrical potential energy of a proton-electron system will increase if the separation between the two is increased.
•  The electrical potential energy of system of two electrons shall increase if the separation between the two is decreased.
Solution

Q46. A metallic solid sphere is placed in a uniform electric field. The lines of force follow the paths shown in figure

•  1
•  2
•  3
•  4
Solution
In a uniform electric field, field line should be straight but line of force cannot pass through the body of metal sphere and must end/start from the sphere normally. All these conditions are fulfilled only in plot (d).

Q47.Effective capacitance between points A and B in the figure, shown is

•  3/14 Î¼F
•  14/3 Î¼F
•  21 Î¼F
•  23 Î¼F
Solution

Q48.Three capacitors 2, 3 and 6 Î¼F are joined with each other. What is the minimum effective capacitance?
•  1/2 Î¼F
•  1 Î¼F
•  2 Î¼F
•  3 Î¼F
Solution

Q49.If the electric flux entering and leaving an enclosed surface respectively is Ï•1 and Ï•2, then, charge enclosed in closed surface is
•  ((Ï•2-Ï•1)/Îµ0 )
•  (Ï•1+Ï•2)/Îµ0
•  (Ï•1-Ï•2)/Îµ0
•  Îµ0 (Ï•2-Ï•1)
Solution
Net electric flux of surface (Ï•2-Ï•1 )=1/Îµ0(q) ⇒q=Îµ0 (Ï•2-Ï•1 )

Q50. In the given network, the value of C, so that an equivalent capacitance between A and B is 3Î¼F, is
•  36Î¼F
•  48Î¼F
•  31/5 Î¼F
• 1/5 Î¼F
Solution

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