UY1: Magnetic Field Lines & Magnetic Flux

Any magnetic field may be represented by magnetic field lines. The line through any point along the magnetic field lines is tangent to the magnetic field vector $\vec{B}$ at that point. Consider an arbitrary surface with magnetic field lines passing through it. You can divide the arbitrary surface into elements of area $dA$. For each $dA$, we have to determine …

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UY1: Force & Torque On Current Loop In Magnetic Field

Consider a rectangular loop of wire with side lengths a and b, in a uniform magnetic field $\vec{B}$. The loop carries a current I. The magnetic field is given by: $$\vec{B} = B \hat{k}$$ Recall that the magnetic force is given by: $$\vec{F} = I \vec{l} \times \vec{B}$$ Hence, the magnetic force on the straight segment on the right of …

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UY1: Magnetic Force On A Curved Conductor

In this post, we will look at an example. The conductor has a straight segment with length L perpendicular to the plane of the diagram on the right, with the current opposite to $\vec{B}$, which is followed by a semicircle with radius R and another straight segment with length L. The conductor carries a current of $I$. The magnetic field …

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UY1: Magnetic Force On A Current Carrying Conductor

Consider a straight segment of a conducting wire, with length $l$ and cross-sectional area $A$. The wire is in a uniform magnetic field $\vec{B}$, which is perpendicular to the plane of the diagram and directed into the plane. Average magnetic force on each charge is given by: $$\begin{aligned} \vec{F} &= q \vec{v}_{d} \times \vec{B} \\ F &= qv_{d}B \end{aligned}$$ Total …

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UY1: Hall Effect

Consider a conductor in the form of a flat strip, If the charge carriers in the conductor are electrons: Short overview of what is happening: Initially, the conductor is not polarised. There is a magnetic field incident on the conductor as shown above. Due to the magnetic force experienced by the charge carriers, the charge carriers will be pushed to one …

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UY1: Convective Heat Transfer

In this part, we will look at an example to facilitate understanding of convective heat transfer. Consider a situation where the air in a room is at a temperature of $25^{\circ}\text{C}$, and the outside air is at $-15^{\circ}\text{C}$. What is the rate of heat transfer per unit area through a 2 mm thick glass window pane of thermal conductivity $k …

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Magnetism & Electromagnetism

This topic covers “Magnetism & Electromagnetism” of O Level Physics. (Equivalent to American high school diploma) If this is too basic for you, you can try the more advanced version here (Electromagnetism) and here (Electromagnetic Induction). Simple Phenomena Of Magnetism Magnetism Properties Of Magnets Induced Magnetism & Electrical Method Of Magnetisation Magnetic field and magnetic field lines Temporary and permanent magnets …

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