OHM'S LAW \& FACTORS EFFECTING RESISTANCE
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Current Electricity

268197 C onsider a rectangular slab of length \(L\), and area of cross-section A. A current I is passed through it, if thelength is doubled the potential drop across the end faces

1 Becomes half of theinitial value
2 Becomes oneforth of theinitial value
3 Becomes doubletheinitial value
4 RemainsSame
Current Electricity

268198 A metallic block has no potential difference applied across it, then the mean velocity of free electrons is ( \(T=\) absolute temperature of the block)

1 Proportional to \(T\)
2 Proportional to \(\sqrt{T}\)
3 Zero
4 Finitebutindependent of temperature
Current Electricity

268199 The resistance of a metal increases with increasing temperature because

1 The collisions of the conducting electrons with the electrons increases.
2 The collisions of the conducting electrons with thelatticeconsisting of theions of themetal increases
3 The number of the conduction electrons decreases.
4 The number of conduction electrons increase.
Current Electricity

268200 In the absence of applied potential, the electric current flowing through a metallic wire is zero because

1 Theaverage vel ocity of electron is zero
2 Theedectrons aredrifted in randomdirection with a speed of the order of \(10^{2} \mathrm{~cm} / \mathrm{s}\).
3 The electrons move in random direction with a speed of the order close to that of velocity of light.
4 Electrons and ions move in opposite direction.
Current Electricity

268201 A long constan wire is connected across the terminals of an ideal battery. if the wire is cut in to two equal pieces and one of them is now connected to the same battery, what will be the mobility of free electrons now in the wire compared to that in the first case?

1 same as that of previous value
2 double that of previous value
3 half that of previous value
4 four times that of previous value
Join With Us for More Updates
Current Electricity

268197 C onsider a rectangular slab of length \(L\), and area of cross-section A. A current I is passed through it, if thelength is doubled the potential drop across the end faces

1 Becomes half of theinitial value
2 Becomes oneforth of theinitial value
3 Becomes doubletheinitial value
4 RemainsSame
Current Electricity

268198 A metallic block has no potential difference applied across it, then the mean velocity of free electrons is ( \(T=\) absolute temperature of the block)

1 Proportional to \(T\)
2 Proportional to \(\sqrt{T}\)
3 Zero
4 Finitebutindependent of temperature
Current Electricity

268199 The resistance of a metal increases with increasing temperature because

1 The collisions of the conducting electrons with the electrons increases.
2 The collisions of the conducting electrons with thelatticeconsisting of theions of themetal increases
3 The number of the conduction electrons decreases.
4 The number of conduction electrons increase.
Current Electricity

268200 In the absence of applied potential, the electric current flowing through a metallic wire is zero because

1 Theaverage vel ocity of electron is zero
2 Theedectrons aredrifted in randomdirection with a speed of the order of \(10^{2} \mathrm{~cm} / \mathrm{s}\).
3 The electrons move in random direction with a speed of the order close to that of velocity of light.
4 Electrons and ions move in opposite direction.
Current Electricity

268201 A long constan wire is connected across the terminals of an ideal battery. if the wire is cut in to two equal pieces and one of them is now connected to the same battery, what will be the mobility of free electrons now in the wire compared to that in the first case?

1 same as that of previous value
2 double that of previous value
3 half that of previous value
4 four times that of previous value
For More Updates join with Us
Current Electricity

268197 C onsider a rectangular slab of length \(L\), and area of cross-section A. A current I is passed through it, if thelength is doubled the potential drop across the end faces

1 Becomes half of theinitial value
2 Becomes oneforth of theinitial value
3 Becomes doubletheinitial value
4 RemainsSame
Current Electricity

268198 A metallic block has no potential difference applied across it, then the mean velocity of free electrons is ( \(T=\) absolute temperature of the block)

1 Proportional to \(T\)
2 Proportional to \(\sqrt{T}\)
3 Zero
4 Finitebutindependent of temperature
Current Electricity

268199 The resistance of a metal increases with increasing temperature because

1 The collisions of the conducting electrons with the electrons increases.
2 The collisions of the conducting electrons with thelatticeconsisting of theions of themetal increases
3 The number of the conduction electrons decreases.
4 The number of conduction electrons increase.
Current Electricity

268200 In the absence of applied potential, the electric current flowing through a metallic wire is zero because

1 Theaverage vel ocity of electron is zero
2 Theedectrons aredrifted in randomdirection with a speed of the order of \(10^{2} \mathrm{~cm} / \mathrm{s}\).
3 The electrons move in random direction with a speed of the order close to that of velocity of light.
4 Electrons and ions move in opposite direction.
Current Electricity

268201 A long constan wire is connected across the terminals of an ideal battery. if the wire is cut in to two equal pieces and one of them is now connected to the same battery, what will be the mobility of free electrons now in the wire compared to that in the first case?

1 same as that of previous value
2 double that of previous value
3 half that of previous value
4 four times that of previous value
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Current Electricity

268197 C onsider a rectangular slab of length \(L\), and area of cross-section A. A current I is passed through it, if thelength is doubled the potential drop across the end faces

1 Becomes half of theinitial value
2 Becomes oneforth of theinitial value
3 Becomes doubletheinitial value
4 RemainsSame
Current Electricity

268198 A metallic block has no potential difference applied across it, then the mean velocity of free electrons is ( \(T=\) absolute temperature of the block)

1 Proportional to \(T\)
2 Proportional to \(\sqrt{T}\)
3 Zero
4 Finitebutindependent of temperature
Current Electricity

268199 The resistance of a metal increases with increasing temperature because

1 The collisions of the conducting electrons with the electrons increases.
2 The collisions of the conducting electrons with thelatticeconsisting of theions of themetal increases
3 The number of the conduction electrons decreases.
4 The number of conduction electrons increase.
Current Electricity

268200 In the absence of applied potential, the electric current flowing through a metallic wire is zero because

1 Theaverage vel ocity of electron is zero
2 Theedectrons aredrifted in randomdirection with a speed of the order of \(10^{2} \mathrm{~cm} / \mathrm{s}\).
3 The electrons move in random direction with a speed of the order close to that of velocity of light.
4 Electrons and ions move in opposite direction.
Current Electricity

268201 A long constan wire is connected across the terminals of an ideal battery. if the wire is cut in to two equal pieces and one of them is now connected to the same battery, what will be the mobility of free electrons now in the wire compared to that in the first case?

1 same as that of previous value
2 double that of previous value
3 half that of previous value
4 four times that of previous value
Join With Us for More Updates
Current Electricity

268197 C onsider a rectangular slab of length \(L\), and area of cross-section A. A current I is passed through it, if thelength is doubled the potential drop across the end faces

1 Becomes half of theinitial value
2 Becomes oneforth of theinitial value
3 Becomes doubletheinitial value
4 RemainsSame
Current Electricity

268198 A metallic block has no potential difference applied across it, then the mean velocity of free electrons is ( \(T=\) absolute temperature of the block)

1 Proportional to \(T\)
2 Proportional to \(\sqrt{T}\)
3 Zero
4 Finitebutindependent of temperature
Current Electricity

268199 The resistance of a metal increases with increasing temperature because

1 The collisions of the conducting electrons with the electrons increases.
2 The collisions of the conducting electrons with thelatticeconsisting of theions of themetal increases
3 The number of the conduction electrons decreases.
4 The number of conduction electrons increase.
Current Electricity

268200 In the absence of applied potential, the electric current flowing through a metallic wire is zero because

1 Theaverage vel ocity of electron is zero
2 Theedectrons aredrifted in randomdirection with a speed of the order of \(10^{2} \mathrm{~cm} / \mathrm{s}\).
3 The electrons move in random direction with a speed of the order close to that of velocity of light.
4 Electrons and ions move in opposite direction.
Current Electricity

268201 A long constan wire is connected across the terminals of an ideal battery. if the wire is cut in to two equal pieces and one of them is now connected to the same battery, what will be the mobility of free electrons now in the wire compared to that in the first case?

1 same as that of previous value
2 double that of previous value
3 half that of previous value
4 four times that of previous value