Physics · Current Electricity
Work through this past-paper style MCQ, then read the full explanation. Practice more physics questions on mMCQ with adaptive practice and topic analytics.
The total resistance of wire is inversely proportional to
- A
length
- B
area
- C
temperature
- D
time
he resistance of a wire is inversely proportional to its cross-sectional area. This means that as the area of the wire increases, the resistance decreases. This relationship is described by the formula R = ρ(L/A), where R is the resistance, ρ is the resistivity of the material, L is the length of the wire, and A is the cross-sectional area of the wire. As A increases, R decreases, so it is correct to say that resistance is inversely proportional to area.
The resistance of a wire is directly proportional to its length. This means that as the length of the wire increases, the resistance also increases. Therefore, it is incorrect to say that resistance is inversely proportional to length.
The resistance of a wire is inversely proportional to its cross-sectional area. This means that as the area of the wire increases, the resistance decreases. This relationship is described by the formula R = ρ(L/A), where R is the resistance, ρ is the resistivity of the material, L is the length of the wire, and A is the cross-sectional area of the wire. As A increases, R decreases, so it is correct to say that resistance is inversely proportional to area.
The resistance of most materials increases with an increase in temperature. Therefore, it is incorrect to say that resistance is inversely proportional to temperature.
Resistance is not directly affected by time. It remains constant unless there are external factors like temperature changes or material degradation over time. Therefore, it is incorrect to say that resistance is inversely proportional to time.
Tagged under Physics · Current Electricity · 2022