13.2 Magnetic Pressure Now we put this sheet into a given uniform magnetic field B=uoa 2 Thus on one side of the sheet the magnetic fields cancel 10O 140/2= and on the other side they add up 0a/2+10/2=10C=2B The force on the sheet per unit area(pressure)is =axB=a(10a/2)=a210/2=(2B)2/210