NEET Solved Paper 2014 Question 26
Question: Two cities are 150 km apart. Electric power is sent from one city to another city through copper wires. The fall of potential per km is 8 V and the average resistance per km is 0.5 $ \Omega $ . The power loss in the wire is [AIPMT 2014]
Options:
A) 19.2 W
B) 19.2kW
C) 19.2J
D) 12.2kW
Show Answer
Answer:
Correct Answer: B
Solution:
Potential difference (drop) between two cities $ =150,\times 8,=1200,V $
Average resistance of total wire = $ 0.5\times 150 $ $ =75\Omega $
Power loss $ P=\frac{V^{2}}{R}=\frac{1200\times 1200}{75}=19200W $ $ =19.2kW $
