$A$ galvanometer coil has $100$ turns and an area of $1 \, cm^2$. The restoring torque constant of the coil is $10^{-8} \, N-m/rad$. If the magnetic field is $5 \, T$,what is the current sensitivity?

Which of the following statements is incorrect?

$A$ galvanometer coil has a resistance of $12\,\Omega$ and the meter shows full-scale deflection for a current of $3\,mA$. To convert it into a voltmeter of range $0-18\,V$,what resistance should be added and how?

If only $5 \%$ of the total current is to be passed through a galvanometer of resistance $G$,then the resistance of the shunt will be

Certain galvanometers have a fixed core made of non-magnetic metallic material. The function of this metallic material is

In the circuit (Figure) the current is to be measured. What is the value of the current if the ammeter shown:
$(a)$ is a galvanometer with a resistance $R_{G}=60.00 \; \Omega$;
$(b)$ is a galvanometer described in $(a)$ but converted to an ammeter by a shunt resistance $r_{s}=0.02 \; \Omega$;
$(c)$ is an ideal ammeter with zero resistance?