Electricity for public schools and colleges . ; this current lasting only until the primarycurrent is established and steady. When the current is broken again weobserve another current induced in B, this time in the other direction. Thus the creation or destruction of a field within B produces currents in B,the currents being in opposite directions respectively. There is no current inB, while the current through A is steady; that is, while the field within B isconstant. (ii.) In the next figure the arrangements and connections are the same,but now A can be thrust into B or withdrawn from B. It
Electricity for public schools and colleges . ; this current lasting only until the primarycurrent is established and steady. When the current is broken again weobserve another current induced in B, this time in the other direction. Thus the creation or destruction of a field within B produces currents in B,the currents being in opposite directions respectively. There is no current inB, while the current through A is steady; that is, while the field within B isconstant. (ii.) In the next figure the arrangements and connections are the same,but now A can be thrust into B or withdrawn from B. It is found that bythrusting A, while a current is flowing in it, mto B, we induce in this latter acurrent in the same direction as would have been induced had we left A withinB and had then sent the current through A. So also the withdrawal of A CH. XXI ELECTRO-MAGNETIC INDUCTION 345 answers to stopping the current in it. We find, also, that the currents induced aremore or less violent according as we move A more or less rapidly Fig. ii. (iii.) Similar effects are produced if we thrust a magnet into B, or with-draw it again. We should expect this, having seen that a coil bearing acurrent acts as a weak magnet
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Keywords: ., bookcentury1800, bookdecade1890, bookpubl, booksubjectelectricity
