1.

A non-zero current passes through the galvanometer G shown in the circuit when the key 'K' is closed and its value does not change when the key is opened. Then which of the following statements (s) is/are true?

Answer»

The GALVANOMETER resistance is infinite.
The current through the galvanometer is 40 mA.
After the key is closed, the current through the 200 `OMEGA` resistor is same as the current through the 300 `Omega` resistor.
The galvanometer resistance is 150 `Omega`

Solution :Itis a caseof balancedwheatstonebridge
` therefore(200)/(300) = (100)/( G)impliesG= 150 Omega `

` R_(eq)= ( 500 xx 250) /( 750)= (500)/(3) Omega `
Nowcurrentthroughgalvanometer
`I^-= (10)/( 250)=(1)/(25)= 0.04A = 40m A `
Afterkeyis closedwheatstonebridgeconditionis appliedand SINCE`200 Omega`and `300Omega `are inseriesthereforecurrentthroughbothwill bethe same .


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