Answer:
Explanation:
Given that:
Diameter of the solenoid,
length of the solenoid,
diameter of the wire,
magnetic field at the center of the solenoid,
<u>Now we need the no. of turns incorporated in the length of 90 cm:</u>
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)
- For copper we have resistivity:
We know that resistance is given by:
.....................................(2)
where:
l = length of the conducting wire
a = cross sectional area of the conducting wire
<u>Now we need the length (l) of the wire:</u>
Circumference of the solenoid,
&
<u>Cross-sectional area of wire:</u>
<u>Resistance from eq. (2):</u>