true and false -7
According to the classical model, the atom consists of a positively charged nucleus made up of nucleons (electrons and neutrons), and a number go negatively charged protons in orbit about that nucleus.
F
One elementary charge has a magnitude of 1.6*10^-18C.
F
The force between two charged particles is inversely proportional to the product of their charges and directly proportional to the square of the distance between them.
F
According to Coulomb ́s law, the electrostatic forces experienced by the two charges are equal in magnitude and opposite in direction, and are directed along the line connecting the two particles.
T
The electrostatic force between the proton and electron in a hydrogen atom is 10^39 times stronger than the gravitational force.
T
A neutral atom has the same number of electrons and protons and therefore has no net charge.
T
Metals offer very little resistance to the flow of electric current.
T
Insulators are used for manufacturing of transistors and other solid-state electronic devices.
F
If a positively charged rod is brought close to the top of an uncharged electroscope, the top of the electroscope will be positively charged.
F
The slow drift velocity of electrons is not the speed with which an electrical signal travels down a cable.
T
Conventional electric current direction is from the positive to the negative terminal of power supply.
T
If you bring a positive test charge near another positive charge, the test charge will experience an attractive force.
F
The magnitude of the electric field strength at any point is defined as the force multiplied by unit charge exerted upon any point test charge at that point.
F
The electric field extends radially outward from a positive point charge and radially inward toward a negative point charge.
T
The voltage is defined as the electric potential energy per unit charge.
F
Capacitance of a capacitor is defined as the ratio of the charge stored on any of the plates of the capacitor to the potential difference between the plates.
T
The charge of any object is an integer multiple of the quantum of charge.
T
A defibrillator is basically a large capacitor.
T
A cathode ray tube is a device which forms a visual display on the electron beam produced by an electron gun.
T
The horizontal deflection of the electron beam in an oscilloscope is used as a time measurement by causing the beam to sweep across the phosphor screen at a uniform, predetermined speed.
T
The forces which holds atoms together are electrical in nature.
T
Simple magnets have two "poles" which are designated as north and south.
T
The north poles of two magnets repel each other.
T
If an electric current flows through a straight wire, a magnetic field will be created by that current.
T
If a positive charge q moves with velocity v into the magnetic field B of a magnet, it will experience a force F that is perpendicular to both the velocity and the magnetic field vector.
T
The physical parameters of electrons are "quantized" and can take only certain discrete values.
T
The proton has one quantum of positive charge.
T
Grounding is a procedure of removing the excess charge on an object by means of the transfer ef electrons between it and another object of considerable size, such as the earth.
T
Electric potential is the rate of charge flow.
F
Any current-carrying wire in a magnetic field will experience a force perpendicular to the wire.
T