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Physics - Magnetism Question with Solution | TestHub

PhysicsMagnetismBiot-savart's & Ampere's Circuital lawEasy2 minPYQ_2020

PhysicsEasysingle choice

There is a magnetic material of coercivity $2 \times 1 0^{3} A m^{- 1}$ . What current should flow through solenoid of length $15 c m$ having $150$ turns to demagnetise the substance completely?

Options:

Answer:

Solution:

Coercivity is $H = 2 \times 10^{3}$ ,

For a solenoid, $H = ni$

Number of turns per unit length

$n = \frac{150}{15 \times 10^{- 2}} = 1000$

$\Rightarrow i = \frac{H}{n} = \frac{2 \times 10^{3}}{10^{3}} = 2 A$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:MagnetismSubtopic:Biot-savart's & Ampere's Circuital law

⏱ 2mℹ️ Source: PYQ_2020

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