A telephone cable at a place has four long straight horizontal wires carrying a current of $1.0$ A in the same direction east to west. The earth's magnetic field at the place is $0.39$ G, and the angle of dip is $35^{0}$ . The magnetic declination is nearly zero. What are the resultant magnetic fields at point $4.0$ cm below the cable?

0.000025

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0.50

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1.25

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2.50

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

35^{o}

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

Atelephone cable at a place has four long straight horizontal wirescarrying a current of 1.0 A in the same direction east to west. Theearth’s magnetic field at the place is 0.39 G, and the angle ofdip is 35º. The magnetic declination is nearly zero. What arethe resultant magnetic fields at points 4.0 cm below 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.)

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