Now set up two coils, each of radius 60.0 cm and with a separation between them also of 60.0 cm. Each coil should have 2

[answerhappygod]

Now set up two coils, each of radius 60.0 cm and with a
separation between them also of 60.0 cm. Each coil should have 25
turns and carry a current of 1.25 A. Measure Bx as a function of x
along the axis (i.e. at r = 0) and also as a function of r along
the line between the coils (i.e. at x = 0). (i) What is the origin
of Bx at the centre (i.e. at x = 0, r = 0), and what is 95% of this
value? [2] (ii) From your measurements, over what range of x and
what range of r does the value of Bx remain within 95% of its value
at the centre? [4] (iii) In three dimensions, what shape is the
region in which Bx is between 95% and 105% of its value at the
centre? Also give the approximate dimensions of this
shape.