Materials and Components - ECE Questions and Answers

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Assertion (A): Drift velocity of electrons is proportional to the applied electric field E.

Reason (R): The average drift velocity per unit field is called mobility.

Both A and R are true and R is correct explanation of A

Both A and R are true but R is not correct explanation of A

A is true but R is false

A is false but R is true

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The materials having low retentivity are suitable for making

temporary smagnets

weak magnets

permanent magnets

both temporary and permanent magnets

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If ∈_r = ∈_r^' - j∈_r^" tan δ = .

True

False

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Assertion (A): Electron concentration n, hole concentration p and charge concentration n_i are related by n_i² = np.

Reason (R): p type semiconductor is obtained by adding trivalent impurity to intrinsic semiconductor.

Both A and R are true and R is correct explanation of A

Both A and R are true but R is not correct explanation of A

A is true but R is false

A is false but R is true