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एक 20 ओम प्रतिरोध वाला धारामापी 0.005 ऐम्पियर धारा से पुरे पैमाने पर विक्षेप देता है। इसे 1 ऐम्पियर तक धारा नापने वाले अमीटर में किस प्रकार बदलेंगे? इस परिवर्तित अमीटर का प्रतिरोध ज्ञात कीजिए।

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`S=((i_(g))/(i-i_(g)))G=((0.005)/(1-0.005))xx20=0.10` (समान्तर में)
`R=(SG)/(S+G)=(0.1xx20)/(0.1+20)=(2)/(20.1)=0.0995Omega`.

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