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Physics JCCC Exam 1 Questions and Answers
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Physics JCCC Exam 1 Questions and Answers
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Physics JCCC Exam 1 Questions andAnswers
All 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= - Answer-1.6 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? - Answer-6 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? - Answer-metals (copper, gold, aluminum, steel)
Definition: substances that do not easily allow for the movement of electrons through
the material - Answer-electrical insulators
Name some good electrical insulators - Answer-rubber, glass, wood, ceramics, rocks
Name a semi-conducting material - Answer-silicone
What is the charge after rubbing an ebonite rod with fur? - Answer-negative charge
What is the charge after rubbing a glass rod with silk or plastic? - Answer-positive
charge
Are electrons created or destroyed? - Answer-Nope, jsust transfered
What is the net charge of a system before and after? - Answer-always zero
Which elements on the periodic table tend to accept electrons? why? - Answer-Far
right, because their electron shells are almost full
What happens as you gain more electrons? - Answer-they become negatively charged
Placing an object in contact with ( ) allows for redistribution of charge - Answer-a
conductor
What happens if the charged object and conductor are identical? - Answer-the charge
will redistribute equally
Which charges repulse each other : like charges or opposite charges? - Answer-like
charges
Which charges are attracted to each other : like charges or opposite charges? - Answer-
opposite charges
What happens when you take a negative charge away from the sphere? - Answer-
eventually everything will be neutral
When does redistribution of charge of the conducting object occur? - Answer-when 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? -
Answer-The 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 - Answer-Coulumb's Law
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