5. (a) An RC circuit is connected across an ideal DC voltage source through an o

Question

5. (a) An RC circuit is connected across an ideal DC voltage source through an open switch (the resistance and capacitance are in series). The switch is closed at time 0 s. Which of the following statements regarding the circuit are correct? (There may be more than one correct choice.) auit are correct? (There may me citor can ***The potential difference across the resistor is always greater than the potential difference across the capacitor ***The potential difference across the capacitor is always greater than the potential difference across the resistor. ***Once the capacitor is essentially fully charged, there is no appreciable current in the circuit. ***The potential difference across the resistor and the potential difference across the capacitor are always equal b) A light bulb is connected to a 110-V soure: What io he resistance of this bulb ifit i a 10- bulb? magnetically attracted or repelled? (d) Does the magnetic force change the speed of a particle carrying charge (always, sometimes, never)? Does it accelerate a particle carrying charge (always, sometimes, never)?

Explanation / Answer

5(a)The correct answer is:

Once the capacitor is essentially fully charged, there is no appreciable current in the circuit.

b)V = 110 V ; P = 100 W

We know that,

P = VI = I^2R = V^2/R

R = V^2/P = 110^2/100 = 121 Ohm

Hence, R = 121 Ohm

c)They are magnetically attracted, since they carry currents in the same direction.

d)Never, they just change the direction of motion

Never. No change in velocity no acceleration.

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