Physics
WAEC 1990
Birds can perch safely on overhead electric power cables without being electrocuted because
-
A.
birds can withstand high p.d. of the electric power cables
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B.
any accumulated charge on the birds is quickly dissipated
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C.
the feet of the birds are well insulated
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D.
the current is a.c. and has particular direction
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E.
there is no p.d between the birds and the cables
Correct Answer: Option E
Explanation
A bird remains safe on a single wire because it has only one point of contact, keeping it at a single electrical potential. However, if the bird touches another object with a different potential, it would complete a path to the ground, resulting in severe electric shock or electrocution.
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