Physics II: U pets 4 net (10-* A • mº) -unet, iz (mA) (a) (6) In the figure on t
ID: 2031600 • Letter: P
Question
Physics II:
U pets 4 net (10-* A • mº) -unet, iz (mA) (a) (6) In the figure on the left two concentric coils lying in the same plane carry currents in opposite directions. The current in the larger coil 1 is fixed. Current iz in coil 2 can be varied. The figure on the right gives the net magnetic moment of the two-coil system as a function of i2. The vertical axis scale is set by Pnet, s = 4.00x10-5 A*m2, and the horizontal axis scale is set by i2s = 11.00 mA. If the current in coil 2 is then reversed, what is the magnitude of the net magnetic moment of the two-coil system when iz = 6.820 mA?Explanation / Answer
At I2=0 ,unet=u1=4*10-5 A-m2
At I2 =5.5 mA=>unet=u1-NI2A2 =4*10-5-N2A2*5.5*10-3
N2A2=7.2727*10-3
If I2 is inversed ,then
unet=(4*10-5)+(7.2727*10-3 )(6.82*10-3)
unet=8.96*10-5 A-m2