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Physics - Magnetism Question with Solution | TestHub

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

PhysicsEasysingle choice

A horizontal overhead power line is at a height of $4 m$ from the ground and carries a current of $100 A$ from east to west. The magnetic field directly below it on the ground is $(μ_{0} = 4 π \times 10^{- 7} H m^{- 1})$

Options:

Answer:

Solution:

By Ampere's theorem, $\vec{B} \cdot 2 πd = μ_{0} i$

$\vec{B} = \frac{μ_{0} i}{2 πd} = \frac{4 π \times 10^{- 7} \times 100 A}{2 π \times 4 m} = 50 \times 10^{- 7} T$

$\Rightarrow B = 5 \times 1 0^{- 6} T$ southwards.

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

⏱ 2mℹ️ Source: PYQ_2020

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