8070

Physics Electrostatics Level: Misc Level

The capacitance of a capacitor depends on 

A) the charge on it.

B) the potential difference across it.

C) the energy stored in it.

D)More than one of these.

E) None of these.


8069

Physics Electrostatics Level: Misc Level

Each plate of a parallel-plate air capacitor has an area of 0.0010 m2, and the separation of the plates is 0.080 mm.An electric field of 4.7x106 V/m is present between the plates.The capacitance of the capacitor, in pF, is closest to;

A)110 B) 74 C) 190 D) 150 E) 220


8068

Physics Electrostatics Level: Misc Level

Three point charges are placed at the following (x,y) coordinates; charge+5.0x10-6Cat(0,0.7m0, charge+7.0x10-6Cat(0.9m,0), and charge-5.0x10-6Cat (0.9m,0.7m).Calculate the electrical potential at the origin due to these three point charges.Take the zero of potential to be at infinity.


8066

Physics Electrostatics Level: Misc Level

A proton with speed1.5x105 m/s falls through a potential difference of 100 volts,gaing speed.What is the speed reached?

A) 4.56x105 m/s

B) 2.04X105 m/s

C) 3.55x105 m/s

D)  8.80X105 m/s

E) 1.55x106 m/s


8065

Physics Electrostatics Level: Misc Level

Point charges,Q1=+69 nC and Q2=-98 nC, are placed as shown.In Figure, an exteral force transports an electron from point A to point B.The work done by the external force is closest to;

A) +1000eV B)+840eV C)+670eV D) -1000 eV E)-670 eV


8064

Physics Electrostatics Level: Misc Level

In Figure a cube of insulating material has one corner at the origin. Each side of the cube has length 0.020 m, so the top face of the cube is parallel to the xz-plane and is at y=0.02 m.It is observed that there is an electric field E=(7960 N/C.m)y j, that is in the+y direction and whose magnitude depends only on y. use Gauss,s Law to calculate the net charge enclosed by the cube.

(Note; eo=8.854x10-12 C2/N.m2)


8063

Physics Electrostatics Level: Misc Level

When there is a net static charge present on a perfect conductor, and no other charges are present

A) the chargewill be uniformly distributed over the outside of the conductor 9i.e., the surface charge density will be constant)

B) every point throughout the entire conductor will be at zero potential.

C) every point throughout the entire conductor will be at a constant potential, but not necessarily at zero potential,

D) the electric field inside the conductor need not be zero if the conductor is hollow.

E) the surface charge density will be greatest where the conductor is flat and smallest where there are sharp protuberances or points.


8062

Physics Electrostatics Level: Misc Level

In Figure ,an electron is projected from plate A,directly towards plate B,with an initial velocity of vo=2.0x107 m/s.The velocity of the electron as it strikes plate B is closest to ;

A)1.2X107 m/s

B)1.5X107 m/s

C)1.8X107 m/s

D)2.1X107m/s

E)2.4X107 m/s


8061

Physics Electrostatics Level: Misc Level

In Figure a, small 80 g insulating sphere is suspended from point p by a silk thread that in 50 cm long.The sphere bears an unknown electric charge Q.A positive point charge q=+2.0uC is brought to a  position directly below p,and the sphere is repelled to a new position,30 cm to the right of q,asshown.The charge Qin uC, is closest to;

A)+1.5

B)+2.0

C)+2.5

D)+3.0

E)+3.5


7594

Physics Electrostatics Level: Misc Level

An automatic external defibrillator delivers 125 J of energy at a voltage of 1050 V. What is the capacitance of this device.


7593

Physics Electrostatics Level: Misc Level

A parallel plate capacitor has plates of an area of area.0066 m squared and a separation of.45 mm. (a)Find the magnitude of the charge on each plate when the capacitor is connected to a 12-V battery. (b) will your answer to part (a) increase ,decrease,or stay the same if the separation between the plates is increased. explain.(c) calculate the magnitude of the charge on the plates if the separation is .90 mm.


7592

Physics Electrostatics Level: Misc Level

Consider a region in space where where a uniform electric field E=7500 n/c points in the negative x direction. (a) what is the orientaion of the equipotential surfaces. (b) if you move in the positive x direction, does the electric potential increase or decreas. explain.(c) what is the distance between the +14-v and the +16-v equipotenentials.


7590

Physics Electrostatics Level: Misc Level

A square of a side a has charges+Q at each corner. What is the electric potential energy of this system of charges.


7589

Physics Electrostatics Level: Misc Level

Point charges +4.1 uC and -2.2 uC are placed on the x axis at (11 m,0) and (-11,0), respectively. (a) Sketch the electric potential on the x axis for this system. (b) your sketch should show on epoint on the x axis between the two charges where the potential vanishes.In the point closer to the +4.1 uC charge or closer to the -2.2 uC. explain. (c)  find the point refered to in part b


7539

Physics Electrostatics Level: Misc Level

A positive charge of 2*10^-6 coul experience of 06 newton when placed at a point in an electric field. The strength of the field at that point in newton/coul is?


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