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If a long straight wire carries a current of 40 A, then the magnitude of the field B at a point 15 cm away from the wire is

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`6.7 xx 10^(-5) T`
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AAKASH SERIES-ELECTROMAGNETICS-PROBLEMS (LEVEL -I)
  1. If a long straight wire carries a current of 40 A, then the magnitude ...

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  2. A wire carrying a current of 125 A is bent into the form of a circle o...

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  3. A current of 4A is flowing through a circular coil of radius 20 cm con...

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  4. A wire carrying a current of 12A is in the form of a circle. It is nec...

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  5. Two conductors each of length 18 m lie parallel to each other in air. ...

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  6. A long straight conductor carrying a current of 4 A is in parallel to ...

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  7. Two parallel conductors A and B separated by 15 cm carry electric curr...

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  8. The area of the coil in a moving coil galvanometer is 8 cm^2 and has 1...

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  9. A coil of area 150 cm^2 having 250 turns carriers a current of 2 mA....

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  10. A galvanometer of resistance 30 Omega is shunted by a 30 Omega resist...

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  11. A maximum current of 1.5 mA can be passed through a galvanometer of re...

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  12. A galvanometer has resistance 500 ohm. It is shunted so that its sensi...

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  13. A galvanometer has a resistance of 100 Omega. A current of 2 xx 10^(-3...

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  14. The resistance of galvanometer is 999 Omega. A shunt of 1Omega is conn...

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  15. A galvanometer has a resistance of 96 Omega. If 4% of the main current...

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  16. A circular coil of wire of radius 'r' has 'n' turns and carries a curr...

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  17. Two wires A and B are of lengths 40 cm and 30 cm. A is bent into a cir...

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  18. A long horizontal rigidly supported wire carriers a current ia = 96 A....

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  19. A circular coil of radius 3cm has 50 turns. It is placed on the horizo...

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  20. A cable 5 m above the ground carries a current of 50 A from south to n...

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