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Which of the following formulae doesn’t account for correct expression for J?

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Which of the following formulae doesn’t account for correct expression for J?

(a) ρv

(b) I/wd

(c) σE

(d) µH

I got this question in semester exam.

I'm obligated to ask this question of The Hall Effect topic in chapter Conduction in Semiconductors of Electronic Devices & Circuits

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The correct option is (d) µH

Explanation: B=µH

So, option d is correct option.

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