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A compass needle whose magnetic moment i...

A compass needle whose magnetic moment is `60Am^2` pointing geograhic north at a certain place, where the horizontal component of earth's magnetic field is `40muWbm^-2` experiences a torque `1*2xx10^-3Nm`. What is the declination of the place?

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The correct Answer is:
`30 ^(@)`
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SL ARORA-MAGNETISM-Based on (i) Earth s Magnetism (ii) magnetic field of a bar magnet
  1. The vertical and horizontal components of earth's magnetic at a place ...

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  2. A vertical wire in which current is flowing produces a neutral point w...

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  3. A compass needle whose magnetic moment is 60Am^2 pointing geograhic no...

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  4. A magnetic needle free to rotate about the vertical direction (compass...

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  5. The true dip at a place is 30^(@) . What is the apparent dip when the ...

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  6. The values of the apparent angles of dip in two planes at right angles...

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  7. A dip circle lies initially in the magnetic meridian. If it is now rot...

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  8. A magnetic needle of length 10cm, suspended at its middle point throug...

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  9. A long bar magnet has a pole strength of 10 Am. Find the magnetic fiel...

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  10. Calculate the magnetic field due to a bar magnet 2cm long and having p...

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  11. A bar magnet of length 0.1 m has a pole strength of 50 Am . Calculate ...

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  12. A bar magnet has a length of 8cm. The magnetic field at a point at a d...

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  13. The magnetic moment of a current carrying loop is 2.1xx10^(-25) ampxxm...

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  14. If the earth's magnetic field has a magnitude 3.4 xx 10^(-5) T at the ...

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  15. The intensities of magnetic field at two points on the axis of a bar m...

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  16. Two magnets N1S1 and N2S2 having their magnetic moments as M and 3M re...

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  17. A short bar magnet of magnetic moment 0*5JT^-1 is placed with its magn...

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  18. A magnetic dipole of magnetic moment 1.44 A m^2 is placed horizontally...

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  19. A bar magnet 30 cm long is placed in the magnetic meridian with its no...

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  20. A neutral point is found on the axis of a bar magnet at a distance of ...

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