A galvanometer with a coil of resistance `12Omega` shows a full scale deflection for a current of `2*5mA`. How will you convert it into a voltmeter of range `7*5V`? Also, find the total resistance of voltmeter formed.

A galvanometer with a coil of resistance `12Omega` shows a full scale

1.	A galvanometer with a coil of resistance `12Omega` shows a full scale deflection for a current of `25mA`. How will you convert it into a voltmeter of range `75V`? Also, find the total resistance of voltmeter formed.
Answer» A galvometer can be converted into a voltmeter of given range by connecting a suitable resistance R in series with galvanometer, which is given by, `R=V/I_g-G=(75)/(25xx10^-3)-12=2988Omega` Total resistance of voltmeter formed `=R+G=2988+12=3000Omega`

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A galvanometer with a coil of resistance `12Omega` shows a full scale deflection for a current of `2*5mA`. How will you convert it into a voltmeter of range `7*5V`? Also, find the total resistance of voltmeter formed.

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A galvanometer with a coil of resistance `12Omega` shows a full scale deflection for a current of `25mA`. How will you convert it into a voltmeter of range `75V`? Also, find the total resistance of voltmeter formed.