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| Numerical 05 |
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| 05. A long straight wire carries a current of 4A. What is the magnetic field at a point distant 10cm from the wire? |
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| The figure shows a long straight wire carrying current and point P where the field is to be obtained. |
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| OP = a = 0.1m. The magnetic field B is |
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| B = mo I/2 a |
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| = (4 x 10-7x 4) 2 x 10 -1 |
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| = 8 x 10-6 T |
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| According to the right-hand screw rule, the field is perpendicular to the plane of page and is directed away from the reader. It is represented as q. |
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Moving Charges and Magnetism
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