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Subjective Problems Set 1 (in Hindi)
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2 subjective questions, easy level, basic questions using minimal theory.

## Udit Gupta is teaching live on Unacademy Plus

Udit Gupta
A Mechanical Engineer from NIT Allahabad here to help learners with physics. Also a Star ⭐ educator.

U
thanks for providing such an awesome content. I knew nothing about banking before but. now i am able to understand all important terms.
sir you are brilliant your teaching skills are awesome thank you sir sir please make video on magnetism from now onwards
Udit Gupta
a year ago
started will upload in a week
1. Problems in capacitors Udit Gupta Ex-VMC Physics Faculty MNNIT Allahabad

2. Subjective Problem -1 A parallel plate capacitor has plates of area 400cm2 and separation between the plates 2.00mm. What potenticl difference will be developed if a charge of 1.00nC is given to the capacitor? If the plate separation is now increased to 4.00mm, what will be the new potential difference? 2

3. Approach Level 1-Easy Basic definitions -) Parallel plate capacitor

4. Solution: On increasing the separation from 2mm to 4mm, the capacitance is decreased by a factor of 2 If the charge remains same, the potential difference will increase by a factor of 2. Thus the new potential difference will be 5.65 x 2 11.3V The capacitance of a parallel plate capacitor is given as: EgA C= C = 8.85 10-12 x too x 10-4 C = 0.177 10-9F 2 10-3 The potential dittererics between the plates is: 5.65V = = C 0.177

5. Subjective Problem - 2 An isolated sphere has a capacitance of 25pF Calculate its radius. b) How much charge should be placed on it to raise its potential to 104V? 5

6. Approach Level 1-Easy Basic definitions Spherical Capacitor

7. Solution (a): The capacitance of an isolated sphere is: 25 10-12- 9 109 R 22.5cm Solution (b): Q CV 25 x 10-12 x 10 0.25uC

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