The forbidden energy band gap in conductors, semiconductors and insulators are $E G_1, E G_2$ and $E G_3$ respectively. The relation among them is
A(a) $E G_1=E G_2=E G_3$
B(b) $E G_1
C(c) $E G_1>E G_2>E G_3$
D(d) $E G_1E G_3$
[MP PMT 1994; RPMT 1997]
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B(b) $E G_1
(b) In insulators, the forbidden energy gap is very large, in case of semiconductor it is moderate and in conductors the energy gap is zero.
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In a transistor, a change of $8.0 mA$ in the emitter current produces a change of $7.8 mA$ in the collector current. What change in the base current is necessary to produce the same change in the collector current