445

Physics Electrostatics Level: High School

A 5.0 g sphere on 1.0-m-long thread has a charge of 100 nC. If it hangs at an angle of 10 degree to the vertical , what is the strength of the electric field ?



444

Physics Electrostatics Level: High School

A plastic rod that has been charged to -15 nC touches a metal sphere . Afterwards , the rods change is o nC.

(a) What kind of charged particle was transformed between the rod and the sphere , and in which direction ? That is , did it move from the rod to the sphere or from the sphere to the rod ?

(b) How many charged particles were transferred ?




443

Physics Electrostatics Level: High School

A student gives a 0.50 m x 0.50 m sheet of tin foil a charge of 75 nC . What is the magnitude of the electric field close to the sheet ?



442

Physics Electrostatics Level: High School

What are the strength and direction of the electric field at the position indicated by the dot as per the figure at “click here” ?



440

Physics Electrostatics Level: High School

What is the net electric force on charge B as per the figure at “click here” ?



439

Physics Electrostatics Level: High School

Consider a small positive text charge located on an electric field line at same point , such as point P as shown in the figure at "click here" . In the direction of the velocity and / or acceleration of the text change along this line ? Discuss ?



438

Physics Electrostatics Level: High School

Why can lines of two force never cross ?



437

Physics Electrostatics Level: High School

Draw the electric field lines surrounding the negative charges a distance L apart ?



436

Physics Electrostatics Level: High School

The earth produces an inwardly directed electric field of magnitude 150 V/m near its surface

(a) What is the potential of earth’s surface relative to V = 0 at r = infinite ?

(b) If the potential of earth is chosen to be zero, what is the potential at infinity ?(Ignore the fact that positive charge in the ionosphere approximately cancels the Earth’s net charge ; how would affect this in your answer ?)




435

Physics Electrostatics Level: High School

An electron acquires 16.4 x 10^-16 J of kinetic energy when it is accelerated by an electric field from plate A to plate B . what is the potential difference between the plates and which plate is at higher potential ?



434

Physics Electrostatics Level: High School

How much work is needed to move a -7.0 microC charge from ground to a point whose potential is +6.00 V higher ?



433

Physics Electrostatics Level: High School

A 15.0cm diameter nonconducting sphere carries a total charge of 12.0 micro C . distributed uniformly throughout its volume . Graph the electric field E as a function of the distance r from the centre of the sphere from r = 0 to r = 30 cm .



432

Physics Electrostatics Level: High School

A solid metal sphere of radius 3.00m carries a total charge of -3.50 microC. What is the magnitude of the electric field at a distance from the sphere center of

(a) 0.15m

(b) 2.90m,

(c) 3.10m

(d) 6.00m ?

How would the answer differ if the sphere were (e) a thin shell , or (f) a solid nonconductor uniformly charged throughout ?



431

Physics Electrostatics Level: High School

Define gravitational flux in analogy to electric flux . Are there “sources” and “sinks” for the gravitational field as there are for the electric field ? Discuss .



430

Physics Electrostatics Level: High School

The electric field E is zero at all points on a closed surface ; is there necessarily no net charge with in the surface ? If a surface encloses zero net charge , is the electric field necessarily zero at all points on the surface ?

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