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Physics JCCC Exam 1 Questions and Answers 100% Correct
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Exam of 5 pages for the course JCCC at JCCC (Physics JCCC Exam 1)
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Physics JCCC Exam 1All atoms except hydrogen are composed of ( ), ( ), and ( ) - answer protons
neutrals
electrons
What is neutral hydrogen composed of? - answer one proton and one electron
protons and ( ) have pretty much the same mass - answer neutrons
What is the fundamental unit of charge? – answer e
e= - answer1.6 x 10^-19
What is the SI unit for e? – answer C (coulomb)
What objects are said to be electrically neutral? - answer An object or atom with zero
net charge (equal number of positive and negative charges that cancel each other out)
What is the smallest amount of free charge? – answer e
What does q stand for? - answer the charge of larger magnitude
What does N stand for in q=Ne - answer integer number of e (must be a whole number)
What is the net charge ofa carbon nucleus? - answer6 protons x e
What equation do you use to find the net charge of an element? – answer q=Ne
Definition: change is neither created nor destroyed but only transfers from one object to
another. - answer Law of Conservation of Charge
According to the Law of Conservation of Charge, an isolated system is always ( ) -
answer conserved
Which is charged: carbon atom or carbon ion - answer Carbon ion, because you add or
take away electrons
Definition: substance that readily allows for the movement of electrons through the
material - answer electrical conductors
electrical conductors are usually good ( ) - answer thermal conductors
, Name some electrical conductors? - answermetals (copper, gold, aluminum, steel)
Definition: substances that do not easily allow for the movement of electrons through
the material - answerelectrical insulators
Name some good electrical insulators - answerrubber, glass, wood, ceramics, rocks
Name a semi-conducting material - answersilicone
What is the charge after rubbing an ebonite rod with fur? - answernegative charge
What is the charge after rubbing a glass rod with silk or plastic? - answerpositive charge
Are electrons created or destroyed? - answerNope, jsust transfered
What is the net charge of a system before and after? - answeralways zero
Which elements on the periodic table tend to accept electrons? why? - answerFar right,
because their electron shells are almost full
What happens as you gain more electrons? - answerthey become negatively charged
Placing an object in contact with ( ) allows for redistribution of charge - answera
conductor
What happens if the charged object and conductor are identical? - answerthe charge
will redistribute equally
Which charges repulse each other : like charges or opposite charges? - answerlike
charges
Which charges are attracted to each other : like charges or opposite charges? -
answeropposite charges
What happens when you take a negative charge away from the sphere? -
answereventually everything will be neutral
When does redistribution of charge of the conducting object occur? - answerwhen the
charged object is brought near a grounded, conducting object
What happens when a positive sphere is grounded and a negative rod is placed on it? -
answerThe electrons go to the ground
Definition: Point charges that are positively and negatively charged exert electrostatic
forces on one another in accordance with Coulumb's law - answerCoulumb's Law
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