Magnetic field at the centre of a circular coil of radius r, through which a current I flows is
A. directly proportional to r
B. inverseley proportional to I
C. directly proportional to I
D. directly proprotional to I2
Answer:C
Magnetic field at the centre of a circular coil of radius r, through which a current I flows is
A. directly proportional to r B. inverseley proportional to I C. directly proportional to I D. directly proprotional to I2