Unit 4 Physics Edexcel A2 and Edexcel IAL

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Could any help in explaining why the answer is B. Why is charging instantaneous when switch is closed?
Thanks in advance

When the switch is closed the capacitor charges up. However, as the capacitor doesn't charge through the resistor there is no resistance when charging. Therefore t = RC = 0, which means the capacitor will charge up instantaneously.

Im probably being stupid but i cant work out why the answer to the question is C and not D


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I cant quite understand where im going wrong with part bii) any help would be greatly appreciated

Why is the answer B? Im struggling to work out why

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An alpha particle has a charge of +2 and a beta particle has a charge of -1. Therefore the alpha particle has 2q in the equation.

Could anyone help me with derivation from s
SI units?

And also in deriving this? Im not quite sure why the answers B? I keep getting D for some reason

And also in deriving this? Im not quite sure why the answers B? I keep getting D for some reason

Area under the graph represents change in momentum, i.e. m(v-u) but since he starts from rest, u = 0. Therefore area under graph = mv

area = 8x5x0.5 = 20
20 = mv
20 = 1.5v
v= 13.3333

Hi. You have the graph of Force and time so the area under the graph represents the momentum. As you get momentum, they have asked to find the speed so you have the mass and momentum also(as you calculated it). Now simply, just substitute the values in the formula for Momentum= Mass multiplied by Velocity and you will get your answer

F=BIL
in units: N = T x Amps x m (length)
therefore T = N / (A x m)

Hope it helps!