Edexcel A Level Physics Topic 7 Electric
and Magnetic Fields June 2024 Exam
Questions and Answers 100% Pass
Electric Field Strength at a point, equation - Answer>>The force
experienced per unit charge by a small positive charge placed at
that point in the field. Unit: V m-1 or N C-1
E=F/Q
electric field - Answer>>- a force field, a region where a charged
particle experiences a non contact force, either attraction or
repulsion
Coulomb's law of force - Answer>>F=Q1Q2/4πε₀r² where Q1 &
Q2 are charges, ε₀ is the permittivity of free space
r= the distance between Q1 and Q2
what happens if the charges are opposite or alike -
Answer>>opposite- the force is attractive, F will be negative
alike- force is repulsive, F will be positive
Field line - Answer>>Line followed by a small mass in a
gravitational field, or a positively charged object in an electrical
field
inverse square law - Answer>>the further apart the charges, the
weaker the force between them
what happens in a radial field - Answer>>E is inversely
proportional to r²
- radial field is where the field strength is strongest at the centre of
an object and weakens as you move away
, point charge - Answer>>charge is concentrated in centre, has
radial field
- for positive Q, a small positive 'test' charge would be repelled
- for negative Q, a small positive 'test' charge would be attracted
electric field strength equation - Answer>>- also inverse square
law
Uniform field, how can it be produced - Answer>>region where
the electric field strength is the same in magnitude and direction
at every point in the field
-produced by connecting 2 parallel plates to opposite poles of a
battery
-field lines are parallel, same distance apart, go from positive to
negative
-field strength is the same, depends on the PD and distance
between parallel plates, E=V/d
what is electric potential, equation - Answer>>- the potential
energy per unit charge
-in a radial field electric potential is given by V=Q/4πε₀r
where r= distance from the charge
-the sign of V depends on charge Q, is V is positive, Q is positive,
negative when Q is negative
-V will be 0 at infinite distance from the charge
Electric potential energy at a point - Answer>>the work done in
bringing a small positive charge from infinity to that point. Unit: V
what happens to V for repulsive and attractive forces -
Answer>>repulsive - V is initially positive, tends to 0 as r
increases to infinity
attractive- V is initially negative and tends to 0 as r increases
towards infinity
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