Write the principle of a moving coil galvanometer. Prove that the deflection is proportional to the current flowing in the coil. On what factors does the current sensitivity of a moving coil galvanometer depend?

OR

Define the elements of Earth's magnetic field. Give any two dif

Question

Write the principle of a moving coil galvanometer. Prove that the deflection is proportional to the current flowing in the coil. On what factors does the current sensitivity of a moving coil galvanometer depend?

OR

Define the elements of Earth's magnetic field. Give any two differences between ferromagnetic, diamagnetic and paramagnetic substances.

Accepted Answer

>

> [!TLDR]
> A current loop in a radial magnetic field experiences a deflecting torque $\propto I$, balanced by the restoring torque of the suspension, giving $	heta\propto I$.
>
> **Principle of a moving coil galvanometer:** A current-carrying rectangular coil, suspended in a strong radial magnetic field (produced by a permanent magnet with curved pole pieces and a soft-iron core), experiences a torque that tends to rotate it; the coil is restrained by a spring/suspension providing a restoring torque proportional to the twist, so it comes to rest at a deflection proportional to the current through it.
>
> **Proof that deflection $\propto$ current:** For a coil of $N$ turns, area $A$, carrying current $I$, placed in a radial field of magnitude $B$ (so that $\vec{B}$ is always in the plane of the coil, perpendicular to its normal), the deflecting torque is
> $$	au_{def} = NIAB$$ …

Q.Write the principle of a moving coil galvanometer. Prove that the deflection is proportional to the current flowing in the coil. On what factors does the current sensitivity of a moving coil galvanometer depend?

Q.Write the principle of a moving coil galvanometer. Prove that the deflection is proportional to the current flowing in the coil. On what factors does the current sensitivity of a moving coil galvanometer depend?

Q.Write the principle of a moving coil galvanometer. Prove that the deflection is proportional to the current flowing in the coil. On what factors does the current sensitivity of a moving coil galvanometer depend?

🔒Unlock the full solution

Q.Write the principle of a moving coil galvanometer. Prove that the deflection is proportional to the current flowing in the coil. On what factors does the current sensitivity of a moving coil galvanometer depend?

🔒Unlock the full solution

Unlock the full solution

Unlock the full solution