The magnetic field Bat the center of a circular coil of wire carrying a current /(as in Fig. 20-9) is HONI B = 2r where Nis the number of loops in the coil and ris its radius. Imagine a simple model in which the Earth's magnetic field of about 1G (= 1 x 10-4 T) near the poles is produced by a single current loop around the equator. Roughly estimate the current this loop would carry.
The magnetic field Bat the center of a circular coil of wire carrying a current /(as in Fig. 20-9) is HONI B = 2r where Nis the number of loops in the coil and ris its radius. Imagine a simple model in which the Earth's magnetic field of about 1G (= 1 x 10-4 T) near the poles is produced by a single current loop around the equator. Roughly estimate the current this loop would carry.
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The magnetic field Bat the center of a circular coil of wire carrying a current /(as in Fig. 20-9) is roNI 2r where Nis the number of loops in the coil and ris its radius. Imagine a simple model in which the Earths magnetic field of about 1G (= 1 x 104 T) near the poles is produced by a single current loop around the equator. Roughly estimate the current this loop would carry. FIGURE 20-9 Magnetic field lines due to a circular loop of wire.
Transcribed Image Text:The magnetic field Bat the center of a circular coil of wire carrying a current / (as in Fig. 20-9) is
MONI
B
2r
where N is the number of loops in the coil and ris its radius. Imagine a simple model in which the Earth's
magnetic field of about 1G (= 1 x 10-4 T) near the poles is produced by a single current loop around the equator.
Roughly estimate the current this loop would carry.
FIGURE 20-9 Magnetic field lines due to a circular loop of wire.
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