Physics
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 rg and ra are respectively the electrical resistivities of gold and aluminium, then which one of the following relations is correct?

C1 = C2
C1>C2
C1pa = C2pg
C2>C1

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Physics
Negative feedback in amplifiers

Decreases bandwidth and increases noise
Increases bandwidth and decreases noise
Increases bandwidth and increases noise
Decreases bandwidth and decreases noise

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