the resistance of a circular coil of 50 turns and 10 cm diameter is 5 ohm what must be the potential difference across the ends of the coil so as to nullify the Earth's magnetic field (H=0.314 gauss) at the centre of the coil how should the coil be placed to achieve this result
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Answer:
The potential difference across the ends of the coil is 0.25 V.
Explanation:
Given that,
Number of turns = 50
Diameter = 10 cm
Resistance = 5 ohm
Magnetic field
We need to calculate the current
Using formula of magnetic field
Put the value into the formula
We need to calculate the potential difference
Hence, The potential difference across the ends of the coil is 0.25 V.
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