Post-UTME Physics 2019 Objective — Question 2
Question 2 of 20 from the Post-UTME Screening (Post-UTME) Physics 2019 Objective paper, with the correct answer and a full explanation.
Advertisement
The material of an electric wire of length 1.0m has a resistivity of 6.0x10^-6 ohm.m. If the cross-sectional area of the wire is 4.0x10^-3 cm^2, the resistance of the wire is
- A. 1.50 x 10^1 ohmCorrect
- B. 0.60 x 10^3 ohm
- C. 0.15 x 10^2 ohm
- D. 1.50 x 10^-3 ohm
Explanation
Convert area: 4.0x10^-3 cm^2 = 4.0x10^-7 m^2. R = (resistivity x length)/area = (6.0x10^-6 x 1.0)/(4.0x10^-7) = 15 ohm = 1.50x10^1 ohm.
Advertisement
Sign up free to unlock
- Score tracking
- Practice history
- Saved questions
- Progress dashboard
- Personalized sessions
- Weak-topic breakdown
…and/or go further with premium services and No Ads.