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A galvanometer has a coil of …

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A galvanometer has a coil of resistance 100 Ω showing a full-scale deflection at 50µA . What resistance should be added to use it as (a) a voltmeter of range 50 V (b) an ammeter of range 10mA?

Posted by Ďãřşháñăã Yadav ? ? ? 6 years, 2 months ago

CBSE > Class 12 > Physics

7 answers

Řøhăň Řąjpůť ✌️✊ 6 years, 2 months ago

welcome. ?

Ďãřşháñăã Yadav ? ? ? 6 years, 2 months ago

thx.

Řøhăň Řąjpůť ✌️✊ 6 years, 2 months ago

b) 50 μA = (10mA) r /r+100 Ω .... r=0.5 ohm

Řøhăň Řąjpůť ✌️✊ 6 years, 2 months ago

a) 50 μA = 50v/100 Ω + R ..... solve this u will get R which is equal to 10^6 ohm

Řøhăň Řąjpůť ✌️✊ 6 years, 2 months ago

When a potential difference of 50 V is applied across the voltmeter, full-scale deflection should take place. Thus, 50µA should go through the coil.

Řøhăň Řąjpůť ✌️✊ 6 years, 2 months ago

To convert galvanometer to voltmeter, connect a large resistance in series with it. To convert galvanometer to ammeter, connect a small resistance in parallel with it. The current through the galvanometer should not exceed its full scale current.

Ďãřşháñăã Yadav ? ? ? 6 years, 2 months ago

it's not much important if ur free then answer otherwise OK

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