Astudent is experimenting with some insulated copper wire and a power supply. she

Explanation:

Given that:

Diameter of the solenoid,

length of the solenoid,

diameter of the wire,

magnetic field at the center of the solenoid,

Now we need the no. of turns incorporated in the length of 90 cm:

For solenoids we have:

...............................(1)

where:

permeability of the medium

n = no. of turns per unit length

I = current in the coil

So,

Now putting the respective values in the eq. (1)

We know that resistance is given by:

.....................................(2)

where:

l = length of the conducting wire

a = cross sectional area of the conducting wire

Now we need the length (l) of the wire:

Circumference of the solenoid,

&

Cross-sectional area of wire:

Resistance from eq. (2):

they are not in you or they just don't work in you?

Explanation: