Question

e) point C and D only 3; If the resistivity of an iron wire, which has a temperature coefficient a = 5 x 10-3 (o C -1, ls 10% 10-8 Ω·m at 20 °C, then its resistivity (in 2.m) at 50 °C will be: -8 8 b) 11.5 x10 c) 12 x 10 -10 d) 12.5 10 e) 13 x10-8 24 The electric fieid (in N/C) at point p due to the charged rod shown is: a) 310 b) 6 105 4.5 x10 d) 9x105 e) 7.5 x 105 0.1 m

Answer 1

summary - resistivity of iron ore is 11.5*10^-5 ohm meter

electric field = 7.5*10⁵ N/C