Charge
Is charge a scalar or a vector quantity?
Scalar
Is Force a vector or a scalar quantity?
Vector quantity
Is Electric Field a vector or a scalar quantity?
A vector quantity
Friction
What is a conductor?
A material where electricity flows easily
The SI Unit of Charge is ...
Coulomb (C)
Two charges are at a distance of 0.36 m, q1=+2 nC and q2=+7 nC. Find their force of internaction. Is their force attractive or repulsive?
F=9.7 x 10^-7 N
Repulsive
True or False: Unlike the Electric Force, an Electric field can be generated by one charge only (1 charge is enough)
True
What is the meaning of charging by induction?
Charging an object without touching it
What is an insulator
A material where electricity does not flow easily
What is a charge?
The physical property that makes matter experiencing electromagnetic interactions
Two charges, equal in magnitude, are affected by a force of 1.2 N. If their distance is 0.9 m, find the magnetide of the charges.
q1=q2=q=1.04 x 10^-5 C.
True or False: If the Electric field is made by a "positive" charge, E points "inward (to)" the charge.
False
What is the meaning of charging by conduction?
Charging an object by touching it
An example of conuctor...
Silver,
Copper,
Gold,
Steel,
Iron
How many (extra) protons does a charge of +18 pC have?
1.13 x 10^8 protons
Three charges q1=-2 pC (x=0 m), q2=-3 pC (x=0.3 m), and q3=+1 pC (x=0.45 m) are displayed along the x-axis. Find the net force acting on q2 (magnitude and direction).
Fnet = 1.8 x 10^-12 N
To the right
In the formula E=k*Q/(r^2), Q is the charge that is "affected by the field" or the charge that "makes the field"?
In the case of this formula, Q makes the field.
An example of insulator
Glass, Ceramic, Plastic
The forces of attraction or repulsion between two charges are equal in magnitude but opposite in direction.
True
An object has 3x10^12 protons and 2.7x10^12 electrons. Find magnitude and sign of the charge (in C).
Q=+4.8 x 10^-8 C
Three charges are displayed as follows: q1=+3 microC (at x=0 m), q2=-2 microC (at x=0.2 m), and q3=+4 microC (at an unknown position to the right of q2). The net force on q2 is equal to 0 N.
Find the distance between q2 and q3.
r(23)=0.23 m
A charge Q=+6 nC produces an Electric Field at a point P. The magnitude of the Electric Field at point P is E=150 N/C.
Find the distance between the charge and the point P.
r=0.6 m
Two charges have opposite signs. Along the x-axis, at points between the two charges, will the electric fields produced by these charges point in the same direction or in opposite directions? Explain your answer.
E of both charges will point in the same direction
What is a semiconductor?
Material with properties in between conductors and insulators