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Poles of a Magnet

nta long stra...

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nta long straight horizontal cable carries a current of 2.5 A in the direction 10degree south of west to 10 north of east.the magnetic meredian of the place happen to be 10 west of the geografic meredian.the earth magnetic feild at the location is 0.33 G and the angle of dip is zero .locate the neutral pointsn

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Q. A long straight horizontal cable carries a current of

2.5 A

in the direction

10^{\circ}

south of west to

10^{\circ}

north of east. The magnetic meridian of the place happens to be

10^{\circ}

west of the geographic meridian. The earth's magnetic field at the location is

0.33 G

, and the angle of dip is zero. Then neutral points lie on a straight line (ignore the thickness of the cable).

Q. A long straight horizontal cable carries a current of

2.5

A in the direction

10^{0}

south of west to

10^{0}

north of east. The magnetic meridian of the place happens to be

10^{0}

west of the geographic meridian. The earth's magnetic field at the location is

0.33

G, and the angle of dip is zero. Locate the line of neutral points (ignore the thickness of the cable). (At neutral points, magnetic field due to a current carrying cable is equal and opposite to the horizontal component of earth's magnetic field.)

Q. A long straight horizontal cable carries a current of 2.5 A in thedirection 10° south of west to 10° north of east. The magnetic meridianof the place happens to be 10° west of the geographic meridian. The earth’s magnetic field at the location is 0.33 G, and the angle of dipis zero. Locate the line of neutral points (ignore the thickness of thecable)? (At neutral points, magnetic field due to a current-carryingcable is equal and opposite to the horizontal component of earth’smagnetic field.)

Q. At a certain location in Africa, a compass points

12^{o}

west of the geographic north. The north tip of the magnetic needle of a dip circle placed in the plane of magnetic meridian points

60^{o}

above the horizontal. The horizontal component of the earth's field is measured to be

0.16 G

. Specify the direction and magnitude of the earth's field at the location.

Q. A telephone cable at a place has four long straight horizontal wires carrying a current of 1.0A in the same direction east to west. The earth's magnetic field at the place is 0.39G, and the angle of dip is

35^{0}

. The magnetic declination is nearly zero. What are the resultant magnetic fields at points 4.0cm below the cable?

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