Question

62. How many turns of a nichrome wire, 1mm in diameter, should be wound around a porcelain
cylinder with radius 2.5cm to obtain a heater with resistance of 20 ohm? (Resistivity of nichrome =
1 x 10-6 ohm-metre)
(NTSE STAGE-I BIHAR - 2017-18]
(A) 650
(B) 1200
(C) 100
(D) 5​

Answer 1

Answer:

answer is 400000 rounds

this is clear solution of the question