TEST 1
A charge of 12 c passes through an electroplating apparatus in 2.0 min. What is the average current in the apparatus?
0.10A
An electronic component with a 17 olms resistor is rated for use at power levels not exceeding 14W. How much current can safely flow through the component?
0.91 A
At a distance d form a point charge Q, the energy density in its electric field is u. If we now go to a distance of d/2 from the charge, what is the energy density at the new location
2u
The heating element of a toaster is 5.4 m length of nichrome wire of diameter 0.48mm. The resistivity of nichrome at the operating temperature of the toaster is 1.3E-6. How much power?
370 W.
when a dielectric material is introduced between he plates of a parallel-plate capacitor and completely fills the space, the capacitance increase by a factor of 4. What is the dielectric constant of the material that was introduced?
4
an ideal parallel-plate capacitor has a capacitance of C. If the area of the plates is doubled and the distance between he plates is halved, what is the new capacitance
4c
two electrons are 20 mm apart at closest approach. What is the magnitude of the maximum electric force that they exert on each other
5.8 E-25 N
Four point charges of equal magnitude but with varying signs are arranged on three of the corners and a the center of the square of the d as shown in the figure. Which one of the arrows shown represents the net force acting on the center?
A
X and Y are two initially uncharged metal spheres on insulating stands, and they are in contact with each other...
X is negative and Y is positivie
doubling the capacitance of a capacitor that is holding a constant charge causes the energy stores in that capacitor to double
false
if the resistance in a constant voltage circuit is doubled, the power dissipated by that circuit will increase by a factor of two
false
the electric field inside of a charged parallel plate capacitor is not uniform
false
the electron volt eV is a unit of power
false
the length of a certain wire is kept the same while its radius is doubled. The resistance of this wire does not change
false
this dipole in a uniform electric field will not move
false
two protons are released from rest, with only the electrostatic force acting, their acceleration will keep increasing
false
A hydrogen atom consists of a proton and an electron. If the orbital radius of the electro increase, the electric potential energy of the electron due to the proton
increaes
The plates of a parallel-plate capacitor are maintained with constant voltage by a better as they are pulled apart. What happens to the strength of the electric field between he plates during this process
it decreases
Two stationary point charges q1 and q2 are shown in the figures along with a sketch of some field lines representing the electric field produced by them. What can you deduce from the sketch.
q1 is negative and q2 is positive; the magnitude of q1 is less than he magnitude of q2
Electrically neutral objects cannot exert an electrical force on each other
true
a capacitor stores separated charges and has a potential difference, but it has no emf
true
a dielectric material such as paper is inserted between the plates of a capacitor as the capacitor hold a fixed charge on its plates. The electric field between he plates as the dielectric is inserted will become weaker
true
a hydrogen nucleus, which has a charge 6+e, is situated on the left of a carbon nucleus...
true
the fundamental charge (e) is the magnitude of the charge of an electron or proton
true
the resistivity of a material increases as the temperature goes up
true
when a current flows through a metal wire, the moving charges are electrons
true