A metal rod of length 10 cm and a rectangular cross-section of 1 cm x 1/2 cm is connected to a battery across opposite faces. Which of the following is true about its resistance?
Answer & explanation
Correct answer: option 2
The maximum resistance will be achieved when the value of 1/A , is maximum, so that ‘A’ must be minimum and it is minimum when area of cross section is 1 cm x 1/2cm