When a fuse is rated 5A, it means a. It will work only if current is 5A b. It ha

Question

When a fuse is rated 5A, it means a. It will work only if current is 5A b. It has resistance of 5 V/A c. It will melt if current exceed 5A d. It will work only if current is more than 5A The moment we close the RC circuit to charge the capacitor, at t = 0 sec a. Charge on the capacitor plate is minimum and Initial currents is b. Charge on the capacitor plate is maximum and initial current is minimum c. Charge on the capacitor plate is minimum and initial current is maximum d. Charge on the capacitor plate is maximum and initial current is maximum If we double If we double the value of the capacitance and double the value of the resistance is an RC-DC circuit, what happens to the constant? A. It stays the same b. It doubles c. It is divided by 4 d. It is dividec by 2 e. It is multiplied by 4 In the fuse experiment, the current in a wire a. depends only on length of wire b. depends only on resistance of wire c. depends on both resistance and potential difference d. does not depends on resistance and potential difference

Explanation / Answer

1.

Answer is C

since if the current in the circuit exceeds the fuse rated current 5 A ,the fuse will melt and break the circuit.

2.

Answer is A

initially when the RC circuit switch is closed at t=0 ,the capacitor will act as short circuit ,since it is initially uncharged.so current in the circuit is

I=Emf/R

3.

Answer is E

time constant of RC circuit

T=RC

so R2=2R and C2=2C

T=2R*2C=4(RC)

4.Answer is C

since the current in the wire is

I=V/R

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