Two long, parallel, current-carrying wires lie in an xy-plane. The first wire lies on the line y = 0.320 m and carries a current of 30.0 A in the +x direction. The second wire lies along the x-axis. The wires exert attractive forces on each other, and the force per unit length on each wire is 290 µN/m. What is the y-value (in m) of the line in the xy-plane where the total magnetic field is zero?

y = 0.108m

Explanation:

The magnitude of the magnetic force is given by:

   ( 1 )

and the force per unit length is:

  ( 2 )

you first calculate I2 from (2):

With this values of I2 you can the position in which the magnitude of the magnetic field is zero, by using (1) for both wires:

hence, for y=0.108m the magnitude of B is zero

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000

f=ma newton's second law 7x8=56n