## Electrostatics and Capacitance Quiz-2

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.

Q11. The effective capacitance between points A and B is

•  9 Î¼F
•  3 Î¼F
•  6 Î¼F
•  1 Î¼F
Solution

Q12.The electric potential at centre of metallic conducting sphere is
•  Zero
•  Half from potential at surface of sphere
•  Equal from potential at surface of sphere
•  Twice from potential at surface of sphere
Solution

Q13.  Capacitance of a parallel plate capacitor becomes 4/3 times its original value, if a dielectric slab of thickness t=d/2 is inserted between the plates [d is the separation between the plates]. The dielectric constant of the slab is
•   4
•  8
•  2
•  6
Solution

Q14. In the given circuit of figure with steady current, the potential drop across the capacitor must be
•  V
•  V/2
•  V/3
•  2V/3
Solution

Q15.In the arrangement of capacitors shown in figure, each capacitor is of 9 Î¼F, Then the equivalent capacitance between in points A and B is

•  9 Î¼F
•  18 Î¼F
•  4.5 Î¼F
•  15 Î¼F
Solution

Q16. Electric potential at the centre of a charged hollow metal sphere is
•  Zero
• Twice as that on the surface
•  Half of that on the surface
•  Same as that on the surface
Solution

Q17.An electron enters the space between the plates of a charged capacitor as shown. The charge density on the plate is Ïƒ. Electric intensity in the space between the plates is E.A uniform magnetic field Balso exists in the space perpendicular to the direction of E. The electron moves perpendicular to both E and B without any change in direction. The time taken by the electron to travel a distance l in the space is
•  Ïƒl/(Îµ0 B)
•  ÏƒB/(Îµ0 l)
•  (Îµ0 lB)/Ïƒ
•  (Îµ0 l)/ÏƒB
Solution

Q18.Three capacitors each of capacitance 1 Î¼F are connected in parallel. To the combination, a fourth capacitor of capacitance 1 Î¼F is connected in series. The resultant capacitance of the system is
•  4 Î¼F
•  (4/3)Î¼F
•  2 Î¼F
•  (3/4)Î¼F
Solution

Q19.A slab of copper of thickness b is inserted in between the plates of parallel plate capacitor as shown in figure. The separation between the plates is d if b=d/2, then the ratio of capacities of capacitors after and before inserting the slab will be

•  √(2 ) : 1
•  2 : 1
•  1 : 1
•  1 : √(2 )
Solution

Q20. A solid conducting sphere having a charge Q us surrounded by an uncharged concentric conducting hollow spherical shell. Let the potential difference between the surface of the solid sphere and that of the outer surface of the hollow shell be V. if the shell is now given a charge -3Q. the new potential difference between the same two surface is
•  V
•  2V
•  4V
• -2V
Solution
Due to additional charge of -3Q given to external spherical shell, the potential difference between conducting sphere and the outer shell will not change because by presence of charge on outer shell, potential everywhere inside and on the surface of the shell will change by same amount. Therefore, the potential difference between sphere and shell remain unchanged.

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