Four sets of readings were taken for a coil kept at a constant temperature:
Set\;\; Current (A)\;\; Voltage (V)
1\;\;\; 0.20\;\;\;\;\; 1.98
2\;\;\; 0.40\;\;\;\;\; 3.95
3\;\;\; 0.60\;\;\;\;\; 5.89
4\;\;\; 0.80\;\;\;\;\; 7.87
(a) Calculate resistance for each set.
(b) Find the percentage variation between highest and lowest resistance.
(c) Decide if the coil is ohmic within 2 % tolerance (Yes/No).