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For the following diagram the galvanomet...

For the following diagram the galvanometer shows zero deflection then what is the value of R?

Text Solution

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For balanced Wheatstone bridge
` (100)/((100R)/((100+R)))= ( 200)/( 40) " "rArr " "(100+R)/® =5`
` (##MOT_CON_NEET_PHY_C22_SLV_002_S01.png" width="80%">
` 100 + R =5R " "rArr R= (100)/(4) =25 Omega`
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MOTION-Electrical Instrument -EXERCISE -3
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  7. In a ammeter 0.2% of main current passes through the galvanometer. If ...

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  8. If an ammeter is to be used in place of a voltmeter, then we must conn...

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  9. The length of a wire of a potentiometer is 100 cm, and the e.m.f. of i...

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  10. An ammeter reads upto 1 ampere. Its internal resistance is 0.81 ohm. T...

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  11. In a meter bridge experiment null point is obtained at 20 cm. from one...

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  12. In a potentiometer experiment the balancing with a cell is at length 2...

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  13. In a Wheatstone's bridge, three resistances P,Q and R connected in the...

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  14. Shown in the figure below is a meter- bridge set up will null deflecti...

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  15. The current in the primary circuit of a potentiometer is 0.2 A. The sp...

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  16. On interchanging the resistances, the balance point of a meter bridge ...

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  17. In a potentiometer experiment it is found that no current passes throu...

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