NEET2018PhysicsMagnetic Effects of CurrentActual
A long cylindrical wire carrying current of 10 A. has radius of 5 ~mm , then find its magnetic field induction at a point 2 ~mm from the centre of the wire. Current is uniformly distributed.
Options
- A1.6 10⁻⁴ ~T
- B2.4 10⁻⁴ ~T
- C3.2 10⁻⁴ ~T
- D0.8 10⁻⁴ ~T
Correct answer
A. 1.6 10⁻⁴ ~T
Step-by-step solution
aligned B & = ₀ I r 2 R^2 B & = 4 10⁻⁷ 10 2 10⁻³ 2 (5 10⁻³ )^2 = 40 10⁻¹⁰ 25 10⁻⁶ & =1.6 10⁻⁴ ~T aligned