A very small oil drop of mass m carries a charge +q. The potential difference across the plates is V and the separation is d. The weight of the drop is balanced by the electric force. (Buoyancy forces may be considered to be negligible.) Which formula gives the charge on the drop?
A q = mgd/V
B q = mgV/d
C q = Vd/mg
D q = V/mgd
Which row describes the circumstances under which forces act on a charged particle in a uniform electric field?
A
B
C
D
Two oppositely-charged parallel plates are arranged as shown.
An electron is released from rest from the surface of the negatively-charged plate. The electron travels from the negatively-charged plate towards the positively-charged plate. Which graph shows how the force F on the electron varies with its distance x from the negative plate?
In the diagram, the shaded area represents a uniform electric field directed away from the observer (at right-angles into the plane of the paper).
A horizontal beam of electrons enters the field, travelling from left to right. In which direction is this beam deflected by the field?
A upwards (in the plane of the paper)
B downwards (in the plane of the paper)
C away from the observer
D towards the observer
A small charge q is placed in the electric field of a large charge Q. Both charges experience a force F. What is the electric field strength of the charge Q at the position of the charge q?
A F/Qq
B F/Q
C FqQ
D F/q
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