Question Detail

PHY 102 Test Compilation PHY 102 21 Objective Question
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Question

A charge of 5 uC is 120 m from a point where the potential is 10 V. How far is it when the potential is 30 V?
Options
A 3600 m
B 40 m
Correct Answer
C 6 m
D 30 m
Correct Answer

Option B is the correct answer.

Detailed Explanation

For a point charge, V = kQ/r, so V is inversely proportional to r (V x r = constant). V1 r1 = V2 r2 (10)(120) = (30) r2 r2 = 1200/30 = 40 m. Makes sense: to TRIPLE the potential you must move THREE TIMES closer.

Hint

For a point charge, V = kQ/r, so V is inversely proportional to r (V x r = constant).

Question Info

Course: PHY 102
Topic: Test Compilation PHY 102 21
Type: Objective
Difficulty: Not specified
Question 1319 of 1819
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