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Discussion

Science Preparation for Engineering Entrance
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A coil of 50 turns and 10 cm diameter has a resistance of 10 . What must be the potential difference across the coil so as to nullify the Earth's magnetic field H = 0.314 G at the centre of the coil?

 
0.5 V
1.0 V
1.5 V
2.0 V

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Bhavika

It should be 0.25v