Embibe Experts Solutions for Chapter: Magnetic Effect of Electric Current, Exercise 1: MHT-CET Medical 2020

A wire of length $L$ carries current $I$ along $x$ axis. A magnetic field $B=B_0(\hat{ı}-\hat{ȷ}-\hat{k})T$ acts on the wire. The magnitude of magnetic force acting on the wire is

Two parallel conducting wires of equal lengths placed distance $d$ apart carry currents $I_1$ and $I_2$ respectively in opposite directions. The resultant magnetic field at the midpoint of both the wires is (${\mu }_{\mathrm{o}}=$ permeability of free space.)

The current sensitivity of moving coil galvanometer of resistance $100 \mathrm{\Omega }$ is $1 \mathrm{div}/\mathrm{mA}.$ Its voltage sensitivity is

The deflection in the galvanometer falls to ${\left(\frac{1}{5}\right)}^{\mathrm{th}}$ when $4 \mathrm{\Omega }$ resistance is connected in parallel with it. What will be the deflection if an additional resistance of $2 \mathrm{\Omega }$ is connected in parallel with the above shunted galvanometer?