Electricity for public schools and colleges . FiG. i. Fig ii. centric circles about the hole as centre. If the wire be not perpendicular tothe plate, the lines will be ellipse-shaped. This indicates that the lines offorce are circles lying in planes perpendicular to the wire. (ii.) If the wire lie on the plate, we find the filings arranged in straightlines perpendicular to the wire.**-These straight lines are the sections of theconcentric circles, made by the plate. CH. XVII. GALVANOMETERS 2/3 Now let a magnetic needle, so balanced as to turn any way, bejDlaced near such a current; and let us
Electricity for public schools and colleges . FiG. i. Fig ii. centric circles about the hole as centre. If the wire be not perpendicular tothe plate, the lines will be ellipse-shaped. This indicates that the lines offorce are circles lying in planes perpendicular to the wire. (ii.) If the wire lie on the plate, we find the filings arranged in straightlines perpendicular to the wire.**-These straight lines are the sections of theconcentric circles, made by the plate. CH. XVII. GALVANOMETERS 2/3 Now let a magnetic needle, so balanced as to turn any way, bejDlaced near such a current; and let us for the present consideronly the field due to the current, leaving the earths field out ofthe question. It is clear that the needle can be in equilibriumonly when it lies in the plane passing through its point of sus-pension and perpendicular to the wire carrying the current; andwhen, further, its poles are equidistant from the wire. If it is verysmall it may be said to come to rest when it lies in (or is tangentto) one of the above circular
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Keywords: ., bookcentury1800, bookdecade1890, bookpubl, booksubjectelectricity
