FBISE, NCP & NBF-aligned resources for Classes 9–12

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Physics Chapter 11 : Topic 1

Current and Drift Velocity

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The expression $\mathbf{(I = Anvq)}$ shows that electric current in a conductor depends directly on:

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If the drift velocity of charge carriers in a wire is doubled while all other quantities remain unchanged, the current becomes:

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A wire carries current due to electrons moving with drift velocity $\mathbf{(v)}$. If the number density of electrons is doubled, the current will:

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Two wires of the same material carry charge carriers with the same drift velocity. The second wire has twice the cross-sectional area of the first. The current in the second wire is:

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The quantity $\mathbf{(n)}$ in $\mathbf{(I = Anvq)}$ represents:

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The SI unit of $\mathbf{(n)}$ is:

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Which quantity has the SI unit coulomb $\mathbf{(C)}$ in the equation $\mathbf{(I = Anvq)}$?

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A wire carries current because electrons drift through it. The current will increase if:

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For a metallic conductor, the charge carrier is usually:

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The product $\mathbf{(nv)}$ physically represents:

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A conductor has area $\mathbf{(A)}$ and carries current $\mathbf{(I)}$. If both $\mathbf{(A)}$ and $\mathbf{(v)}$ are doubled, current becomes:

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A current of $\mathbf{2\ A}$ flows through a wire. If the charge on each carrier remains unchanged and the drift velocity becomes half, the same current can be maintained by:

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The expression $\mathbf{(I = Anvq)}$ is derived from the idea that current is:

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If electrons move with drift velocity $\mathbf{(v)}$, increasing temperature generally causes current to decrease for a fixed voltage because:

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Which factor does NOT appear explicitly in $\mathbf{(I = Anvq)}$?

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If a wire is stretched so that its area decreases to half while $\mathbf{(n)}$, $\mathbf{(v)}$ and $\mathbf{(q)}$ remain constant, the current becomes:

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A current-carrying wire contains charge carriers of charge $\mathbf{(2e)}$ instead of $\mathbf{(e)}$. For the same $\mathbf{(A)}$, $\mathbf{(n)}$ and $\mathbf{(v)}$, the current will be:

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Which change would increase current the MOST?

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Two conductors carry the same current. The first has twice the number density of charge carriers as the second. If all other quantities are equal, the drift velocity in the first conductor is:

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A wire has current $\mathbf{(I)}$. If $\mathbf{(A)}$ becomes three times and $\mathbf{(n)}$ becomes one-third while $\mathbf{(v)}$ and $\mathbf{(q)}$ remain constant, the new current is:

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The microscopic form $\mathbf{(I = Anvq)}$ helps explain current in terms of:

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A conductor carries current because:

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For a given current, if the cross-sectional area is reduced, the drift velocity must:

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The equation $\mathbf{(I = Anvq)}$ is most useful for relating macroscopic current to:

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The drift velocity in a metal is typically:

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