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Physics problems: electricity

Part 4

 

Problem 31.

In a Millikan oil drop experiment a student sprayed oil droplets with a density of between two horizontal parallel plates that were 6.0 cm apart. The student adjusted the potential difference between the plates to 5000 V so that one of the drops became stationary. The diameter of this drop was measured to be . What was the magnitude of the charge on the drop.

Solution

 

Problem 32.

You want to create an electric field at location . Where would you place a proton to produce this filed at the origin? Instead of a proton, where would you place an electron to produce this filed at the origin?

Solution

 

Problem 33.

A cube of side 1 cm is placed within an electric field of  100 N/C. What is the flux through the (a) top face (b) bottom face (c) right face (d) left face of the cube. What is the net flux through the cube. The electric field is perpendicular to the left face of the cube.

Solution

 

Problem 34.

A particle of charge Q and mass m is accelerated from rest through a potential difference V, attaining a kinetic energy K. What is the kinetic energy of a particle of charge 2Q and mass m/2 that is accelerated from rest through the same potential difference?

Solution

 

Problem 35.

Initially, sphere A has a charge of -50e and a sphere B has a charge of +20e. The spheres are made of conducting material and are identical in size. If the spheres then touch, what is the resulting charge on sphere A?

Solution

 

 

 

Problem 36.

A cube of edge a carries a point charge q at each corner. Find the resultant electric force on any one of the charges.

Solution

 

Problem 37.

A 240 Volts circuit used  energy when left running for 30 minutes. How much electric charge (in Coulombs) flowed in the 30 minutes?

Solution

 

Problem 38.

A charge Q is at center of a cube. What is the electric flux through one face of the cube.

Solution

 

Problem 39.

A charge Q is at center of a tetrahedron (triangular pyramid with congruent equilateral triangles for each of its faces). What is the electric flux through one face of the tetrahedron.

Solution

 

Problem 40.

A sphere of radius 1.5 cm carried a charge  of 10 nC which is uniformly distributed throughout the sphere. Determine the charge density of the sphere.

Solution

 

 

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