Question

Long solenoid is formed by winding 20 turns/cm. The current necessary to produce a magnetic field of 20 milli tesla inside the solenoid will be approximately




a.1.0 a




b.2.0 a




c.4.0 a




d.8.0 a

Answer 1

Answer:

1.0a

Explanation:

this because by divide both the number

Answer 2

ANSWER:

d.8.0 a

EXPLANATION:

The formula for the magnetic field in terms of magnetic turn and current flowing in the solenoid is

The number of windings per meter = 20 x 100 = 2000 turns/m

The magnetic field of the solenoid which is converted into Tesla by multiplying the value by 0.001

$20 \times 10^{-3}$

Hence, According to the formula, the current needed or that flows in the solenoid is

$B=\mu n i$

$i=\frac{B}{\mu m}=\frac{20 \times 10^{-3}}{4 \pi 10^{-7} \times 2000}=8 \mathrm{Amp}$

Therefore, the current flowing in the solenoid is 8 Amp