Tha scale of a galvanometer is divided into `150` equal divisions.The galvanometer has a current sensitivity of 10 divisions per mA and a voltage sensitivity of 2 divisions per mV . The galvanometer be designed to read (i) `6` A per division and (ii) `1 V` per division?

Explanation

The resistance of galvanometer,

`G=("Full scale votage")/("Full scale current")=(75xx10^(-3))/(15xx10^(-3))=5Omega`
For conversion into ammeter of range I amp.
`(I-I_(g))S=I_(g)G`
`thereforeS=(I_(g)G)/(I-I_(g))=(15xx10^(-3)xx5)/((150xx6-15xx10^(-3)))=(15xx10^(-3)xx5)/(150xx6)`
`8.3xx10^(-5)` ohm
For conversion into voltmeter of range V volt, `I_(g)(G+R)=V`
`thereforeR=V/(I_(g))-G=150/(15xx10^(-3))-5-9995` ohm