Class 12 NEET Physics Moving Charges and Magnetism

Diameter of first wire (d1)=0.5 mm Current in first wire (I1)=1 A; Diameter of second wire (d2 )=1 mm and current in second wire (I2)=1 A
Strength of magnetic field due to current flowing in a conductor, (B)=

µ0

4π

×

2I

a

or B∝I.
since the current in both the wires is same, therefore there is no change in the strength of the magnetic field.