Question

a long solenoid having 2000 turns per metre carries a current of 7.8 A.Calculate the magnitude of magnetic field inside the solenoid near its centre.
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Answer 1

Given:

A long solenoid having 2000 turns per metre carries a current of 7.8 A.

To find:

Field intensity inside solenoid?

Calculation:

General expression of field intensity inside solenoids is :

$\rm \: B = \mu_{0} \times n \times i$

• 'n' is turns per unit lenth
• 'i' is current

$\rm \implies\: B = 4\pi \times {10}^{ - 7} \times 2000\times 7.8$

$\rm \implies\: B = 196035.3\times {10}^{ - 7}$

$\rm \implies\: B \approx 0.0196 \: T$

So, magnetic field intensity at centre of solenoid is approximately 0.0196 Tesla.

Answer 2

Explanation:

long solenoid having 2000 turns per metre carries a current of 7.8 A.

To find:

Field intensity inside solenoid?

Calculation:

General expression of field intensity inside solenoids i