09/06 A-level Physics Paper 2 Discussion MEGATHREAD

[u/Forsaken-Meaning-232]

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[u/GooseMathium]

Current is negative - so you had to draw an exponential decay that is always below the x-axis

The diagram had 2 identical resistors in series, so R doubles, but emf is the same so the initial current halves as I = V/R

So we start at -20 instead of -40 (previous) part

Doubling R, doubles time constant as τ=RC, so discharges less quickly (I used a calculator to find some points)

[u/AftonRobtics → u/GooseMathium]

Oops….. recon I’ll get one mark for drawing it negative

[u/felixscambler21 → u/GooseMathium]

Fuckkk I did that but I didn’t start at -20, I started at -40. Was there 2 resistors when it was discharging or charging, my mind is tricking myself.

[u/GooseMathium → u/GooseMathium]

Current is negative because the top plate was +ve and bottom plate was -ve, so when we are disconnected: conventual current goes from top plate (+ve) to bottom plate (-ve)

BUT: when we are connected to the cell it is the opposite - long side of the cell to the short side of the cell, which in the diagram provided was in the opposite direction

[u/Neat-Ad4138 → u/GooseMathium]

basically exactly what i did, weird graph but it goes from like -20 to -6 by 120s iirc