Question 1
A battery has an emf, ![]() | |
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a) | As the variable resistor is varied, the power dissipated in it will also vary. Show that the power, P, dissipated in the variable resistor is given by |
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b) | If ![]() |
An electron of charge, e, and mass, m, enters the uniform electric field between two parallel charged plates, as shown in the diagram below. |
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The p.d. across the plates is V and the distance between them is d. The initial velocity of the electron is of magnitude, u and is parallel to the plates. The point of entry into the field is midway between the two plates. The electron hits the lower plate after having moved a distance x in the field (x measured parallel to the plates). Show that |
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