PHY 4.5 S2

• F¹² = u⁰I¹/2πd (I²L)

  F²¹ = u⁰I²/2πd (I¹L)

  
• F = u⁰I¹I²L/2πd

  
• B¹ = u⁰I¹/2πd

  B² = u⁰I²/2πd

  
• Consider two identical straight conductors X and Y carryin currents I, and I, with length L are placed parallel to each other as shown below. The conductors are in vacuum and their separation is d.

  
• Using Flemming left hand

  F¹² to the left

  F²¹ to the right

  
• One ampere is defined as the constant current that, when it is flowing in each of two infinitely long, straight, parallel conductors which have negligible of cross sectional areas and are 1.0 metre apart in vacuum, would produce a force per unit length between the conductors of 2.0 x 10^-7 N/m