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Worksheetsrevision ch 1-3
Total questions: 28
Worksheet time: 14mins
An electric field at a point is defined as
the total charge on a particle at that point
the electric force per unit mass at that point
the electric force per unit charge at that point
the electric charge per unit mass of a point charge
A strong electric field has its field lines ____________.
close together
far apart
uneven
in circles
Which image is the electric field of a positive charge?
Coulomb is used to measure
Electric current
Electric potential
Electric charge
Electric resistance
The total electric potential energy a charge has depends on the voltage
True
False
Which of the following statements is TRUE about equipotential surfaces?
The charge density is uniform
The electric field at any point on the equipotential surface is zero
No electric potential difference between 2 nearby equipotential surfaces
No work is done to move a charge along an equipotential surface
Principle of conservation of charges states that
the total charge in an isolated system is constant
the total force in an isolated system is constant
the total electric potential in an isolated system is constant
What is Coulomb's law useful for?
To make my life more difficult
Calculate the force acting in a pair of point charges
Calculate the energy acting in a pair of point charges
Calculate the charge acting in a pair of point charges
Why is the graph shaped as in the figure?
because force F is directly proportional to the product of charges
because force F is inversely proportional to the square of the distance r
because force F is directly proportional to the distance
because force F is directly proportional to the square of the distance r
How can the strength of this electric field be decreased?
use a higher voltage battery
increase the distance between the parallel plates
decrease the distance between the parallel plates
make the parallel plates longer
When will the charge of the capacitor be 63% of the final charge?
At t=Ƭ
At t=0
At t=2Ƭ
At t=Cε
What is happening to the capacitor in figure (a)?
Nothing
Charging
Discharging
Capacitance is...
proportional to the distance between the plates
proportional to the area of the plates
inversely proportional to the energy
inversely proportional to the area
The lower the resistance the ____________ the current
Higher
Lower
What is the opposition to current flow?
Current
Power
Potential difference
Resistance
Which is NOT a dielectric?
air
ceramic
glass
copper
You insert a dielectric into a capacitor, keeping its charge the same. Change in potential?
The potential difference increases.
The potential difference decreases.
The potential difference remains the same.
What happens when a dielectric is put into an already charged capacitor?
The voltage across the capacitor increases
The charge on the capacitor increases
The capacitance of the capacitor increases
Nothing happens
The factors affecting a conductor's resistance
length
cross sectional area
temperature and material
all of the above
Direct Current
always flows in one direction
alternates directions
What is a potential divider?
Something that potentially splits current
Something that splits voltage
Something that potentially makes the circuit work
Something that splits resistances in half
what is a capacitor
a component that doesn't store energy
a component that stores energy
a unit of measure
Which graph best represents the current through a discharging capacitor?
A
B
C
D
The formulas of the current over time flowing through a charging and discharging capacitor are
The same
Not the same
What happens to current in the circuit when the capacitor is charging?
Increases
Decreases
Stays the same
Which graph best represents the charge stored in a charging capacitor?
A
B
C
D
What is the length called when the galvanometer in the potentiometer set up gives a reading of zero?
balanced length
variable length
fixed length
original length
The resistivity of a wire depends on
Length
Material
Cross section area
None of the above
