Manipal MET2021PhysicsMagnetic Effects of Current
A copper wire of diameter 1.6 mm carries a current I . The maximum magnetic field due to this wire is 5 10⁻⁴ ~T . The value of l is :
Options
- A0.2 A
- B0.5 A
- C2 A
- D4 A
Correct answer
C. 2 A
Step-by-step solution
Maximum magnetic field due to wire carrying current is at surface and is given by B= ₀ 4 2 l R or I= B R 2 ( ₀ / 4 ) I= 5 10⁻⁴ ( 1.6 10⁻³ 2 ) 2 10⁻⁷ =2 ~A