A galvanometer coil of resistance 40 Ω, gives full scale deflection with current 10 mA. The value of shunt added to measure the current up to 2.0 A is nearly

40 Ω प्रतिरोध की एक गैल्वेनोमीटर कुण्डली 10 mA धारा के साथ पूर्ण पैमाना विक्षेप दर्शाती है। धारा का मापन 2.0 A तक करने के लिए संयोजित शंट का मान लगभग है

0.1 Ω

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1 Ω

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2 Ω

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0.2 Ω

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Solution

The correct option is D 0.2 Ω
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What will be the area A of the quadrilateral in each case with their diagonal $d c m$ & the sum of their heights $(h_{1} + h_{2}) c m$ .

i) $d = 20, (h_{1} + h_{2}) = 10$

ii) $d = 15, (h_{1} + h_{2}) = 20$

iii) $d = 20, (h_{1} + h_{2}) = 25$

iv) $d = 40, (h_{1} + h_{2}) = 30$

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