A wire of resistance 4 Ω is used to wind a coil of radius
7 cm. The wire has a diameter of 1.4 mm and the
specific resistance of its material is 2 × 10-7 Ω m.
The number of turns in the coil is
A 50
B 40
C 60
D 70
A wire of resistance 4 Ω is used to wind a coil of radius
7 cm. The wire has a diameter of 1.4 mm and the
specific resistance of its material is 2 × 10-7 Ω m.
The number of turns in the coil is
A 50
B 40
C 60
D 70