Solution We can solve this problem by noting that any
charge that appears on one plate of the capacitor must
induce a charge of equal magnitude and opposite sign
on the near side of the slab, as shown in Figure 26.28a.
Consequently, the net charge on the slab remains zero,
and the electric field inside the slab is zero. Hence, the
capacitor is equivalent to two capacitors in series, each
having a plate separation (d - a)/2, as shown in Figure
26.28b.
Solution We can solve this problem by noting that anycharge that appears on one plate of the capacitor mustinduce a charge of equal magnitude and opposite signon the near side of the slab, as shown in Figure 26.28a.Consequently, the net charge on the slab remains zero,and the electric field inside the slab is zero. Hence, thecapacitor is equivalent to two capacitors in series, eachhaving a plate separation (d - a)/2, as shown in Figure26.28b.
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