Physics (AS & A Level) · May / June 2016 · Paper 42 · Question 9
9702
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A magnetic field of flux density B is normal to face PQRS of a slice of a conducting material, as shown in Fig. 9.1. P X Q Y R S Z magnetic field flux density % FXUUHQW I Fig. 9.1 A current I in the slice is normal to face QRZY of the slice. The Hall voltage VH across the slice is given by the expression VH = BI ntq .
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9(a)(i)[1]
number density of charge carriers/free electrons or number per unit volume of charge carriers/free electrons [1]
9(a)(ii)[1]
PX or QY or RZ [1]
9(b)(i)[2]
VH is inversely proportional to n for semiconductors, n is (much) smaller than for metals [2]
9(b)(ii)[3]
magnetic field would deflect holes and electrons in same direction (because) electrons are (–)ve, holes are (+)ve so VH has opposite polarity/opposite sign [3]
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