Sample questions
You've seen the pattern — here are a few of the actual PYQs.
CDS2017
A parallel-plate capacitor, with air in between the plates, has capacitance C. If now a dielectric is introduced in between the plates, the capacitance of the capacitor becomes the product of the capacitance C and the value of the dielectric constant 7. Then the value of capacitance will become
- A C
- B C/7
- C 7C ✓
- D 14C
✓ Correct answer: (C)
Science & Technology › Physics & Chemistry
CDS2017
A parallel-plate capacitor of capacitance C1 is made using two gold plates. Another parallel-plate capacitor of capacitance C2 is made using two aluminium plates with same plate separation, and all the four plates are of same area. If ρg and ρa are respectively the electrical resistivities of gold and aluminium, then which one of the following relations is correct?
- A C1 > C2
- B C2 > C1
- C C1ρa = C2ρg
- D C1 = C2 ✓
✓ Correct answer: (D)
Science & Technology › Physics & Chemistry
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