Selected MC questions on electrostatics KEY
... where the fields from each charge point in opposite directions and also closer to the smaller charge, which is to the left of the +Q charge (the answer will be to the left of –1 m). Let the distances to the +Q and the –2Q charge be x and (X + 2), respectively. This gives E1 = E2 and kQ/x2 = k(2Q)/(x ...
... where the fields from each charge point in opposite directions and also closer to the smaller charge, which is to the left of the +Q charge (the answer will be to the left of –1 m). Let the distances to the +Q and the –2Q charge be x and (X + 2), respectively. This gives E1 = E2 and kQ/x2 = k(2Q)/(x ...
Electrons and Photons
... Cathode rays are not electromagnetic waves because they are deflected by electric and magnetic fields and their speed is not equal to that of light. Q2. Explain the production of cathode rays. Ans2. Cosmic rays are present in the tube which are constantly reaching the earth from the outer space. The ...
... Cathode rays are not electromagnetic waves because they are deflected by electric and magnetic fields and their speed is not equal to that of light. Q2. Explain the production of cathode rays. Ans2. Cosmic rays are present in the tube which are constantly reaching the earth from the outer space. The ...
B 2.
... 6. (10%) There is a continuing discussion on radiation hazards to human health. The U. S. standard for personal safety in a microwave environment is that the power density be less than 10 mw/cm2. A cell-phone boost-station radiates energy at a rate of 50 kW. Calculate the corresponding standard in t ...
... 6. (10%) There is a continuing discussion on radiation hazards to human health. The U. S. standard for personal safety in a microwave environment is that the power density be less than 10 mw/cm2. A cell-phone boost-station radiates energy at a rate of 50 kW. Calculate the corresponding standard in t ...
Unit Test #1- Electricity and Magnetism Time: 1 hour Total: 25
... c) Charged objects attract some neutral objects d) Opposite electric charges attract each other 2. All of the following methods of charging objects are true, except a) None of the following b) Charging by contact leaves both objects similarly charged c) Charging by induction and grounding leaves bot ...
... c) Charged objects attract some neutral objects d) Opposite electric charges attract each other 2. All of the following methods of charging objects are true, except a) None of the following b) Charging by contact leaves both objects similarly charged c) Charging by induction and grounding leaves bot ...
solutions - Brock physics
... Remember that v = f λ for a wave. Thus, if the frequency stays the same but the wavelength decreases, the speed also decreases. (b) Electric equipotential surfaces i. are close together where the electric field is strong, and far apart where the electric field is weak. ii. point away from positive c ...
... Remember that v = f λ for a wave. Thus, if the frequency stays the same but the wavelength decreases, the speed also decreases. (b) Electric equipotential surfaces i. are close together where the electric field is strong, and far apart where the electric field is weak. ii. point away from positive c ...
Thursday, Sept. 8, 2011
... Why is this different than the position where the torque is maximized? The potential energy is maximized when the dipole is oriented so that it has to rotate through the largest angle against the direction of the field, to reach the equilibrium position at =0. Torque is maximized when the field is ...
... Why is this different than the position where the torque is maximized? The potential energy is maximized when the dipole is oriented so that it has to rotate through the largest angle against the direction of the field, to reach the equilibrium position at =0. Torque is maximized when the field is ...
Exam #: Printed Name: Signature: PHYSICS DEPARTMENT
... surface of a sphere, centered at the origin. The radius r(t) of this sphere is a given function of the time t. In the following, define the kinetic energy such that it accounts for all three Cartesian velocity components of the point particle in the lab frame. (a) Obtain the Lagrangian for this cons ...
... surface of a sphere, centered at the origin. The radius r(t) of this sphere is a given function of the time t. In the following, define the kinetic energy such that it accounts for all three Cartesian velocity components of the point particle in the lab frame. (a) Obtain the Lagrangian for this cons ...
Electrostatics
Electrostatics is a branch of physics that deals with the phenomena and properties of stationary or slow-moving electric charges with no acceleration.Since classical physics, it has been known that some materials such as amber attract lightweight particles after rubbing. The Greek word for amber, ήλεκτρον electron, was the source of the word 'electricity'. Electrostatic phenomena arise from the forces that electric charges exert on each other. Such forces are described by Coulomb's law.Even though electrostatically induced forces seem to be rather weak, the electrostatic force between e.g. an electron and a proton, that together make up a hydrogen atom, is about 36 orders of magnitude stronger than the gravitational force acting between them.There are many examples of electrostatic phenomena, from those as simple as the attraction of the plastic wrap to your hand after you remove it from a package, and the attraction of paper to a charged scale, to the apparently spontaneous explosion of grain silos, the damage of electronic components during manufacturing, and the operation of photocopiers. Electrostatics involves the buildup of charge on the surface of objects due to contact with other surfaces. Although charge exchange happens whenever any two surfaces contact and separate, the effects of charge exchange are usually only noticed when at least one of the surfaces has a high resistance to electrical flow. This is because the charges that transfer to or from the highly resistive surface are more or less trapped there for a long enough time for their effects to be observed. These charges then remain on the object until they either bleed off to ground or are quickly neutralized by a discharge: e.g., the familiar phenomenon of a static 'shock' is caused by the neutralization of charge built up in the body from contact with insulated surfaces.