02. Resistivity
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Current Electricity

152148 A constant voltage is applied between the two ends of a uniform metallic wire. Some heat is developed in it. The heat developed is doubled if

1 both the length and radius of the wire are halved
2 both the length and radius of the wire are doubled
3 the radius of the wire is doubled
4 the length of the wire is doubled where the time remains the same in both the cases
CG PET- 2005
Current Electricity

152150 The material whose resistivity is insensitive to temperature is

1 silicon
2 copper
3 silver
4 nichrome
J and K CET- 2011
Current Electricity

152153 A wire $P$ has resistance of $20 \mathrm{ohm}$. Another wire $Q$ of same material but length twice that of $P$ has resistance of $8 \mathrm{ohm}$. If $r$ is the radius of cross-section of $P$, the radius of cross-section of $Q$ is

1 $\mathrm{r}$
2 $\frac{r}{\sqrt{2}}$
3 $\mathrm{r} \sqrt{5}$
4 $2 \mathrm{r}$
J and K CET- 2007
Current Electricity

152155 An electrical cable of copper has just one wire of radius $9 \mathrm{~mm}$. Its resistance is $10 \Omega$. The single $\mathrm{Cu}$ cable is to be replaced by another cable containing 10 well insulated $\mathrm{Cu}$ wires each of radius $3 \mathbf{~ m m}$. The resistance of the new cable is

1 $7.5 \Omega$
2 $9 \Omega$
3 $9.5 \Omega$
4 $10 \Omega$
J and K CET- 2000
Current Electricity

152157 A high-voltage transmission line has an aluminium cable of diameter $3.0 \mathrm{~cm}, 200 \mathrm{~km}$ long. The resistivity is $2.8 \times 10^{-8} \Omega \mathrm{m}$. The resistance of this cable is

1 $158 \Omega$
2 $15.8 \Omega$
3 $7.9 \Omega$
4 $1.2 \mathrm{k} \Omega$
J and K CET- 1997
Join With Us for More Updates
Current Electricity

152148 A constant voltage is applied between the two ends of a uniform metallic wire. Some heat is developed in it. The heat developed is doubled if

1 both the length and radius of the wire are halved
2 both the length and radius of the wire are doubled
3 the radius of the wire is doubled
4 the length of the wire is doubled where the time remains the same in both the cases
CG PET- 2005
Current Electricity

152150 The material whose resistivity is insensitive to temperature is

1 silicon
2 copper
3 silver
4 nichrome
J and K CET- 2011
Current Electricity

152153 A wire $P$ has resistance of $20 \mathrm{ohm}$. Another wire $Q$ of same material but length twice that of $P$ has resistance of $8 \mathrm{ohm}$. If $r$ is the radius of cross-section of $P$, the radius of cross-section of $Q$ is

1 $\mathrm{r}$
2 $\frac{r}{\sqrt{2}}$
3 $\mathrm{r} \sqrt{5}$
4 $2 \mathrm{r}$
J and K CET- 2007
Current Electricity

152155 An electrical cable of copper has just one wire of radius $9 \mathrm{~mm}$. Its resistance is $10 \Omega$. The single $\mathrm{Cu}$ cable is to be replaced by another cable containing 10 well insulated $\mathrm{Cu}$ wires each of radius $3 \mathbf{~ m m}$. The resistance of the new cable is

1 $7.5 \Omega$
2 $9 \Omega$
3 $9.5 \Omega$
4 $10 \Omega$
J and K CET- 2000
Current Electricity

152157 A high-voltage transmission line has an aluminium cable of diameter $3.0 \mathrm{~cm}, 200 \mathrm{~km}$ long. The resistivity is $2.8 \times 10^{-8} \Omega \mathrm{m}$. The resistance of this cable is

1 $158 \Omega$
2 $15.8 \Omega$
3 $7.9 \Omega$
4 $1.2 \mathrm{k} \Omega$
J and K CET- 1997
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Current Electricity

152148 A constant voltage is applied between the two ends of a uniform metallic wire. Some heat is developed in it. The heat developed is doubled if

1 both the length and radius of the wire are halved
2 both the length and radius of the wire are doubled
3 the radius of the wire is doubled
4 the length of the wire is doubled where the time remains the same in both the cases
CG PET- 2005
Current Electricity

152150 The material whose resistivity is insensitive to temperature is

1 silicon
2 copper
3 silver
4 nichrome
J and K CET- 2011
Current Electricity

152153 A wire $P$ has resistance of $20 \mathrm{ohm}$. Another wire $Q$ of same material but length twice that of $P$ has resistance of $8 \mathrm{ohm}$. If $r$ is the radius of cross-section of $P$, the radius of cross-section of $Q$ is

1 $\mathrm{r}$
2 $\frac{r}{\sqrt{2}}$
3 $\mathrm{r} \sqrt{5}$
4 $2 \mathrm{r}$
J and K CET- 2007
Current Electricity

152155 An electrical cable of copper has just one wire of radius $9 \mathrm{~mm}$. Its resistance is $10 \Omega$. The single $\mathrm{Cu}$ cable is to be replaced by another cable containing 10 well insulated $\mathrm{Cu}$ wires each of radius $3 \mathbf{~ m m}$. The resistance of the new cable is

1 $7.5 \Omega$
2 $9 \Omega$
3 $9.5 \Omega$
4 $10 \Omega$
J and K CET- 2000
Current Electricity

152157 A high-voltage transmission line has an aluminium cable of diameter $3.0 \mathrm{~cm}, 200 \mathrm{~km}$ long. The resistivity is $2.8 \times 10^{-8} \Omega \mathrm{m}$. The resistance of this cable is

1 $158 \Omega$
2 $15.8 \Omega$
3 $7.9 \Omega$
4 $1.2 \mathrm{k} \Omega$
J and K CET- 1997
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Current Electricity

152148 A constant voltage is applied between the two ends of a uniform metallic wire. Some heat is developed in it. The heat developed is doubled if

1 both the length and radius of the wire are halved
2 both the length and radius of the wire are doubled
3 the radius of the wire is doubled
4 the length of the wire is doubled where the time remains the same in both the cases
CG PET- 2005
Current Electricity

152150 The material whose resistivity is insensitive to temperature is

1 silicon
2 copper
3 silver
4 nichrome
J and K CET- 2011
Current Electricity

152153 A wire $P$ has resistance of $20 \mathrm{ohm}$. Another wire $Q$ of same material but length twice that of $P$ has resistance of $8 \mathrm{ohm}$. If $r$ is the radius of cross-section of $P$, the radius of cross-section of $Q$ is

1 $\mathrm{r}$
2 $\frac{r}{\sqrt{2}}$
3 $\mathrm{r} \sqrt{5}$
4 $2 \mathrm{r}$
J and K CET- 2007
Current Electricity

152155 An electrical cable of copper has just one wire of radius $9 \mathrm{~mm}$. Its resistance is $10 \Omega$. The single $\mathrm{Cu}$ cable is to be replaced by another cable containing 10 well insulated $\mathrm{Cu}$ wires each of radius $3 \mathbf{~ m m}$. The resistance of the new cable is

1 $7.5 \Omega$
2 $9 \Omega$
3 $9.5 \Omega$
4 $10 \Omega$
J and K CET- 2000
Current Electricity

152157 A high-voltage transmission line has an aluminium cable of diameter $3.0 \mathrm{~cm}, 200 \mathrm{~km}$ long. The resistivity is $2.8 \times 10^{-8} \Omega \mathrm{m}$. The resistance of this cable is

1 $158 \Omega$
2 $15.8 \Omega$
3 $7.9 \Omega$
4 $1.2 \mathrm{k} \Omega$
J and K CET- 1997
Join With Us for More Updates
Current Electricity

152148 A constant voltage is applied between the two ends of a uniform metallic wire. Some heat is developed in it. The heat developed is doubled if

1 both the length and radius of the wire are halved
2 both the length and radius of the wire are doubled
3 the radius of the wire is doubled
4 the length of the wire is doubled where the time remains the same in both the cases
CG PET- 2005
Current Electricity

152150 The material whose resistivity is insensitive to temperature is

1 silicon
2 copper
3 silver
4 nichrome
J and K CET- 2011
Current Electricity

152153 A wire $P$ has resistance of $20 \mathrm{ohm}$. Another wire $Q$ of same material but length twice that of $P$ has resistance of $8 \mathrm{ohm}$. If $r$ is the radius of cross-section of $P$, the radius of cross-section of $Q$ is

1 $\mathrm{r}$
2 $\frac{r}{\sqrt{2}}$
3 $\mathrm{r} \sqrt{5}$
4 $2 \mathrm{r}$
J and K CET- 2007
Current Electricity

152155 An electrical cable of copper has just one wire of radius $9 \mathrm{~mm}$. Its resistance is $10 \Omega$. The single $\mathrm{Cu}$ cable is to be replaced by another cable containing 10 well insulated $\mathrm{Cu}$ wires each of radius $3 \mathbf{~ m m}$. The resistance of the new cable is

1 $7.5 \Omega$
2 $9 \Omega$
3 $9.5 \Omega$
4 $10 \Omega$
J and K CET- 2000
Current Electricity

152157 A high-voltage transmission line has an aluminium cable of diameter $3.0 \mathrm{~cm}, 200 \mathrm{~km}$ long. The resistivity is $2.8 \times 10^{-8} \Omega \mathrm{m}$. The resistance of this cable is

1 $158 \Omega$
2 $15.8 \Omega$
3 $7.9 \Omega$
4 $1.2 \mathrm{k} \Omega$
J and K CET- 1997