## ELECTROSTATICS AND CAPACITANCE QUIZ-7

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.

Q1. The plates of a parallel plate capacitor are charged up to 200 V. A dielectric slab of thickness 4 mm is inserted between its plates. Then, to maintain the same potential difference between the plates of the capacitor, the distance between the plates is increased by 3.2 mm. The dielectric constant of the dielectric slab is
•  1
•  4
•  5
•  6
Solution

Q2.If a positively charged pendulum is oscillating in a uniform electric field as shown in figure. Its time period as compared to that when it was uncharged will

•  Increase
•  decrease
•  Not change
•  First Increase then decrease
Solution

Q3.  The equivalent capacitance of the combination of the capacitors is

•  3.20 Î¼F
•  7.80 Î¼F
•  3.90 Î¼F
•  2.16 Î¼F
Solution

Q4. Two conducting sphere of radii r1and r2 are at the same potential. The ratio of their charges is
•  r12/ r22
•  r22/ r12
•  r1/ r2
•  r2 / r1
Solution

Q5.Which one of the following graphs figure shows the variation of electric potential V with distance r from the centre of a hollow charged sphere of radius R
•

•

•

•

Solution

Q6. Two insulated metal spheres of radii 10 cm and 15 cm charged to a potential of 150V and 100 V respectively are connected by means of a metallic wire. What is the charge on the first sphere
•  2 esu
•  4 esu
•  6 esu
•  8 esu
Solution

Q7.A 10 Î¼F capacitor and a 20 Î¼F capacitor are connected in series across 200 V supply line. The charged capacitors are then disconnected from the line and reconnected with their positive plates together and negative plates together and no external voltage is applied. What is the potential difference across each capacitor?
•  (800/9) V
•  (800/3) V
•  400 V
•  200 V
Solution

Q8.A hollow charged metal sphere has radius r. If the potential difference between its surface and a point at a distance 3r from the centre is V, then electric field intensity at a distance 3r is
•  (V/2r)
•  (V/3r)
•  (V/6r)
•  (V/4r)
Solution

Q9.Four capacitors are connected as shown in figure. The equivalent capacitance between A and B is

•  4 Î¼F
•  0.25 Î¼F
•  0.75 Î¼F
•  1.33 Î¼F
Solution

Q10. A fully charged capacitor has a capacitance C. It is discharged through a small coil of resistance wire embedded in a thermally insulated block of specific heat capacity s and mass m. If the temperature of the block is raised by ∆T, the potential difference V across the capacitance is
•  √(2mC∆T/s)
•  mC∆T/s
•  ms∆T/C
• √((2ms∆T)/C)
Solution

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