AP Inter 2nd Year Physics Notes Chapter 7 Moving Charges and Magnetism

Students can go through AP Inter 2nd Year Physics Notes 7th Lesson Moving Charges and Magnetism will help students in revising the entire concepts quickly.

AP Inter 2nd Year Physics Notes 7th Lesson Moving Charges and Magnetism

→ A magnetic field always associated with a current.

→ Biot – Savarts law is valid for a symmetrical current distribution.

→ The magnetic field produced by a circular current carrying conductor is non-uniform but for practical purposes it is considered to be uniform at its centre.

→ Charges at rest produces electrostatic interaction where as charges in motion produce magnetic interaction.

→ Magnetic force is much smaller than the electric force.

→ An oscillating and an accelerated charge produces electro magnetic waves.

→ The force experienced by a charged particle moving in space where both electric and magnetic fields exist is called Lorentz force.

AP Inter 2nd Year Physics Notes Chapter 7 Moving Charges and Magnetism

→ Ampere’s circuital law states that the line integral of magnetic field (B) around any closed path is equal to μ0 times the total current (i) in the closed circuit.
\(\oint \overrightarrow{\mathrm{B}} \cdot \overrightarrow{\mathrm{d}} l=\mu_0 \mathrm{i}\)

→ The Television uses the solenoid to generate needed magnetic fields.

→ The Toroid is a hollow circular ring made of insulating material on which a large number of turns of a wire are closely wound.

→ Biot – Savart s law can be represented as \(\overrightarrow{\mathrm{dB}}=\frac{\mu_0}{4 \pi} \cdot \frac{\mathrm{id} l \sin \theta}{\mathrm{r}^2}=\frac{\mu_0}{4 \pi} \cdot \frac{\mathrm{i} \overrightarrow{\mathrm{d} l} \times \overrightarrow{\mathrm{r}}}{\mathrm{r}^3}\)

→ Two parallel wires carrying current in the same direction attract each other and current in opposite direction repel each other.

→ A cyclotron cannot accelerate electrons and neutrons.

→ Ammeter is always connected in series in the circuit.

→ Voltmeter is always connected in parallel in the circuit.

→ An ideal Ammeter has zero resistance.

→ An ideal Voltmeter has infinite resistance.

AP Inter 2nd Year Physics Notes Chapter 7 Moving Charges and Magnetism

→ A planar loop carrying a current i having N closely wound turns and an area A possesses a magnetic moment m.
m = NiA

→ An electron moving around the central neucleous has a magnetic moment μl = \(\frac{\mathrm{e}}{2 \mathrm{~m}} l\)

→ Velocity selector is a set up to select charged particles of a particular velocity from a beam passed through a space having crossed electric and magnetic fields.

Formulae

→ F = q \((\vec{v} \times \vec{B})\) (or) F = Bqυ sin θ

→ dB = \(\frac{\mu_0}{4 \pi} \cdot \frac{\mathrm{id} l \sin \theta}{\mathrm{r}^2}\)

→ B = \(\frac{\mu_0 n i r^2}{2\left(r^2+x^2\right)^{3 / 2}}\)

→ B = \(\frac{\mu_0 \mathrm{ni}}{2 \mathrm{r}}\)

→ B = \(\frac{\mu_0}{4 \pi} \frac{\mathrm{i}}{\mathrm{a}}\left(\sin \phi_2+\sin \phi_1\right)\)

→ B = \(\frac{\mu_0 \mathrm{i}}{2 \pi \mathrm{a}}\)

→ m = nia

→ B = μ0ni (At the centre of the solenoid)

AP Inter 2nd Year Physics Notes Chapter 7 Moving Charges and Magnetism

→ B = \(\frac{\mu_0 n i}{2}\) (At one of its ends of a solenoid)

→ \(\oint \overrightarrow{\mathrm{B}} \cdot \mathrm{d} \vec{l}=\mu_0 \mathbf{i}\)

→ F = \(\mathrm{q}[\overrightarrow{\mathrm{E}}+(\vec{v} \times \overrightarrow{\mathrm{B}})]\)

→ F = \(\mathrm{i}(\vec{l} \times \overrightarrow{\mathrm{B}})=\mathrm{Bi} l \sin \theta\)

→ τ = \(\overrightarrow{\mathrm{M}} \times \overrightarrow{\mathrm{B}}=\mathrm{MB} \sin \theta\)

→ i = \(\frac{\mathrm{C}}{\mathrm{BAN}} \theta\)

→ S = \(\frac{\mathrm{i}_{\mathrm{g}} \mathrm{G}}{\mathrm{i}-\mathrm{i}_{\mathrm{g}}}\)

→ R = \(\frac{\mathrm{V}}{\mathrm{i}_{\mathrm{g}}}-\mathrm{G}\)