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Hi All,

I badly need helpwith the below 2 questions... as for question 2, I worked out part a-c but I'm unable to complete part d.... pls help and correct me if I am wrong.

really appreciate it!

cseet

1. A 125 W heater is designed to operate with an emf of 120 V.

Find the approximate power dissipated in the heater if the potential difference is decreased to 112 V. (Unit: W)

can somebody help me up with this?

2. A 5.2 F capacitor is charged to 1.4E2 V and is then connected across a 4.5E2 resistor. Answer the following questions:

All answers must have three significant digits unless otherwise specified.

(a) What is the initial charge on the capacitor? (Unit: microcoulombs, uC)

answer: 728 uC

(b) What is the initial current just after the capacitor is connected to the resistor? (Unit: milliamperes, mA)

answer: 311 mA

(c) What is the time constant of this circuit? (Unit: milliseconds, ms)

answer: 2.34 ms

but I'm Stuck on this question...

(d) How much charge is on the capacitor after 5.1 ms? (Unit: microcoulombs, uC)

can somebody help me up with this??

thanks again!

cseet

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# Homework Help: HELP PLSSS - Physics

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