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A long straight wire carries a current of 35 A. What is the magnitude of the field B at a point 35 cm from the wire ?

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For an extremely long straight thin current carrying wire, magnetic field produced at perpendicular distance r is,
`B=(mu_(0)I)/(2pir)`
`thereforeB=((4pixx10^-7)(35))/((2pi)(0.2))`
`thereforeB=3.5xx10^(-5)T`
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KUMAR PRAKASHAN-MOVING CHARGES AND MAGNETISM-SECTION B (NUMERICAL FROM TEXTUAL EXERCISE)
  1. A circular coil of wire consisting of 100 turns, each of radius 4.0 cm...

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  2. A long straight wire carries a current of 35 A. What is the magnitude ...

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  3. A long straight wire in the horizontal plane carries a current of 50 A...

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  4. A horizontal power line carries a current of 90A in east to west direc...

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  5. What is the magnitude of magnetic force per unit length on a wire carr...

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  6. A 1.0 cm wire carrying a current of 30 A is placed inside a solenoid p...

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  7. Two long and parallel straight wires A and B carrying currents of 10.0...

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  8. A closely wound solenoid 80 cm long has 4 layers of windings of 500 tu...

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  9. A square coil of side 10 cm consists of 20 turns and carries a current...

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  10. Two moving coil meters M1 and M2 have the following particulars : ...

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  11. In a chamber, a uniform magnetic field of 6.5 G (1 G = 10^(-4) T) is m...

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  12. Obtain the frequency of revolution of the electron in its circular orb...

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  13. (a) A circular coil of 30 turns and radius 8.0 cm carrying a current o...

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  14. Two concentric circular coils X and Y of radii 16 cm and 10 cm, respec...

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  15. A magnetic field of 100 G (1 G = 10^(-4) T) is required which is unifo...

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  16. For a circular coil of radius R and N turns carrying current. Prove th...

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  17. A toroid has a core (non-ferromagnetic) of inner radius 25 cm and oute...

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  18. A magnetic field that varies in magnitude from point to point but has ...

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  19. An electron emitted by a heated cathode and accelerated through a pote...

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  20. A magnetic field set up using Helmholtz coils (described in Exercise 4...

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