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Physics
UTME / JAMB 1978
Electricity and Magnetism
An electric charge could be transmitted through
A
wood, rubber and stone
B
paper, clay and plastic
C
glass, acid and cloth
D
The human body, water and metals
E
all of the above
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #29308)
Physics
UTME / JAMB 1978
Electricity and Magnetism
Solution
The net charge on the atom is zero because
A
the electrons and the protons that are charged are in the nucleus
B
the total charge on the electrons is equal to the total charge on the protons
C
the neutrons from a shield around the charged protons
D
the number of electrons in an atom is half the number of protons
E
A and B above
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
An atom is defined as having the same number of electrons (negative charge), protons (positive charge) and neutrons (no charge). This means that it will have the same amount of negative and positive charge, giving it a net zero charge. On the other hand, an ion has different amount of electrons and protons.
Source: Myschool Past Questions Archive (Record #29325)