Oxford ALG Method sheet AQA Physics There are two ways to find the charge: Metho

Question

Oxford ALG Method sheet AQA Physics There are two ways to find the charge: Method 1 Set up the apparatus as shown in Figure 2. Once the switch is closed, charge will begin to flow. You must adjust the setting of the variable resistor to keep the value of the current constant until the capacitor becomes fully charged (when 0) Once the switch is closed, start a stopwatch and record values for the current and potential difference at regular intervals until the current falls to zero. Intervals of approximately 20 or 30 seconds works well. When the current reaches zero, it is showing that the capacitor has become fully charged. Find the charge, Q. stored on the plates by using the equation Q Ixt high resistance voltmeter A ) microammeter Figure 2 Results Current = 1.1 A Time, t/s Voltage, VIv O 36 053 loo G lerlo3 7.0410 742 1. 3 1J8 2o0 i.75 © Otford University Press 2016 This resounce sheet may have been changed from the original

Explanation / Answer

Assuming voltmeyer draws zero current .

Resistance of the ammeter is negligible .

Actually current varies exponentially , but we are assuming linear change of current with time and assuming the time interval to be very small which is actually of the order of time constant of the circuit  

Related Questions

Navigate

• Browse (All)
• Browse O
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.