00. Electric Current, Current Density and Drift Velocity
Current Electricity

151709 In a metallic conductor, under the effect of applied electric field, the free electrons of the conductor

1 drift from higher potential to lower potential.
2 move in the curved paths from lower potential to higher potential
3 move with the uniform velocity throughout from lower potential to higher potential
4 move in the straight line path in the same direction
Current Electricity

151713 The drift velocity of electrons for a conductor connected in an electrical circuit is $v_{d}$. The conductor is now replaced by another conductor with same material and same length but double the area of cross section.
The applied voltage remains same. The new drift velocity of electrons will be

1 $\frac{v_{d}}{4}$
2 $\frac{v_{d}}{2}$
3 $2 \mathrm{v}_{\mathrm{d}}$
4 $v_{d}$
Current Electricity

151728 Drift velocity of electrons is due to

1 Motion of conduction electron due to random collisions
2 Motion of conduction electron due to electric field.
3 Repulsion to the conduction electron due to inner electrons of ions
4 Collision of conduction electrons with one another
Current Electricity

151733 Drift velocity of electrons in wire of certain length and circular cross section is $v_{d}$. The potential difference across the wire and the wire length are doubled but radius of the cross section is halved. What is the new drift speed?

1 $v_{d} / 2$
2 $2 v_{d}$
3 $v_{d}$
4 $\mathrm{v}_{\mathrm{d}} / 3$
Current Electricity

151709 In a metallic conductor, under the effect of applied electric field, the free electrons of the conductor

1 drift from higher potential to lower potential.
2 move in the curved paths from lower potential to higher potential
3 move with the uniform velocity throughout from lower potential to higher potential
4 move in the straight line path in the same direction
Current Electricity

151713 The drift velocity of electrons for a conductor connected in an electrical circuit is $v_{d}$. The conductor is now replaced by another conductor with same material and same length but double the area of cross section.
The applied voltage remains same. The new drift velocity of electrons will be

1 $\frac{v_{d}}{4}$
2 $\frac{v_{d}}{2}$
3 $2 \mathrm{v}_{\mathrm{d}}$
4 $v_{d}$
Current Electricity

151728 Drift velocity of electrons is due to

1 Motion of conduction electron due to random collisions
2 Motion of conduction electron due to electric field.
3 Repulsion to the conduction electron due to inner electrons of ions
4 Collision of conduction electrons with one another
Current Electricity

151733 Drift velocity of electrons in wire of certain length and circular cross section is $v_{d}$. The potential difference across the wire and the wire length are doubled but radius of the cross section is halved. What is the new drift speed?

1 $v_{d} / 2$
2 $2 v_{d}$
3 $v_{d}$
4 $\mathrm{v}_{\mathrm{d}} / 3$
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Current Electricity

151709 In a metallic conductor, under the effect of applied electric field, the free electrons of the conductor

1 drift from higher potential to lower potential.
2 move in the curved paths from lower potential to higher potential
3 move with the uniform velocity throughout from lower potential to higher potential
4 move in the straight line path in the same direction
Current Electricity

151713 The drift velocity of electrons for a conductor connected in an electrical circuit is $v_{d}$. The conductor is now replaced by another conductor with same material and same length but double the area of cross section.
The applied voltage remains same. The new drift velocity of electrons will be

1 $\frac{v_{d}}{4}$
2 $\frac{v_{d}}{2}$
3 $2 \mathrm{v}_{\mathrm{d}}$
4 $v_{d}$
Current Electricity

151728 Drift velocity of electrons is due to

1 Motion of conduction electron due to random collisions
2 Motion of conduction electron due to electric field.
3 Repulsion to the conduction electron due to inner electrons of ions
4 Collision of conduction electrons with one another
Current Electricity

151733 Drift velocity of electrons in wire of certain length and circular cross section is $v_{d}$. The potential difference across the wire and the wire length are doubled but radius of the cross section is halved. What is the new drift speed?

1 $v_{d} / 2$
2 $2 v_{d}$
3 $v_{d}$
4 $\mathrm{v}_{\mathrm{d}} / 3$
Current Electricity

151709 In a metallic conductor, under the effect of applied electric field, the free electrons of the conductor

1 drift from higher potential to lower potential.
2 move in the curved paths from lower potential to higher potential
3 move with the uniform velocity throughout from lower potential to higher potential
4 move in the straight line path in the same direction
Current Electricity

151713 The drift velocity of electrons for a conductor connected in an electrical circuit is $v_{d}$. The conductor is now replaced by another conductor with same material and same length but double the area of cross section.
The applied voltage remains same. The new drift velocity of electrons will be

1 $\frac{v_{d}}{4}$
2 $\frac{v_{d}}{2}$
3 $2 \mathrm{v}_{\mathrm{d}}$
4 $v_{d}$
Current Electricity

151728 Drift velocity of electrons is due to

1 Motion of conduction electron due to random collisions
2 Motion of conduction electron due to electric field.
3 Repulsion to the conduction electron due to inner electrons of ions
4 Collision of conduction electrons with one another
Current Electricity

151733 Drift velocity of electrons in wire of certain length and circular cross section is $v_{d}$. The potential difference across the wire and the wire length are doubled but radius of the cross section is halved. What is the new drift speed?

1 $v_{d} / 2$
2 $2 v_{d}$
3 $v_{d}$
4 $\mathrm{v}_{\mathrm{d}} / 3$