A galvanometer measures small currents using the principle that the torque on a coil in a magnetic field is proportional to:
Athe current
Bthe square of the current
C1/current
Dthe magnetic flux only
Answer & Solution
Correct answer: A. the current
τ = NIAB sin θ ⇒ deflection ∝ I.
Related questions
Two straight long conductors $AOB$ and $COD$ are perpendicular to each other and carry curA cell is connected between the points $A$ and $C$ of a circular conductor $ABCD$ of centrAn infinitely long conductor $PQR$ is bent to form a right angle as shown. A current $I$ fFor a positively charged particle moving in a $x - y$ plane initially along the $x$-axis, A small square loop of wire of side $l$ is placed inside a large square loop of wire of siA wire of length $1\,\mathrm{m}$ is moving at a speed of $2\,\mathrm{ms}^{-1}$ perpendiculA uniform but time-varying magnetic field $B(t)$ exists in a circular region of radius $a$The unit ratio μ0 ε0 has the same dimensions as: