02. Resistivity
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Current Electricity

152139 Which of the following graph represents the variation of resistivity $(\rho)$ with temperature $(T)$ for copper?

1 a
2 b
3 c
4 d
NEET SEP-2020
Current Electricity

152140 A piece of copper is to be shaped into a conducting wire of maximum resistance. The suitable length and diameter are and respectively :

1 $2 \mathrm{~L}$ and $\mathrm{d} / 2$
2 $L / 2$ and $2 d$
3 L and d
4 $2 \mathrm{~L}$ and $\mathrm{d}$
Karnataka CET-2017
Current Electricity

152141 If the length of a wire is doubled its resistance becomes

1 2 times
2 4 times
3 3 times
4 unchanged
CG PET- 2012
Current Electricity

152143 Calculate the resistance of an aluminium wire of length $50 \mathrm{~cm}$ and cross- sectional area 2.0 $\mathrm{mm}^{2}$. The resistivity of aluminium is $\rho=2.6 \times 10^{-8} \Omega-m$

1 $0.0065 \Omega$
2 $0.065 \Omega$
3 $0.1265 \Omega$
4 None of these
CG PET- 2012
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Current Electricity

152139 Which of the following graph represents the variation of resistivity $(\rho)$ with temperature $(T)$ for copper?

1 a
2 b
3 c
4 d
NEET SEP-2020
Current Electricity

152140 A piece of copper is to be shaped into a conducting wire of maximum resistance. The suitable length and diameter are and respectively :

1 $2 \mathrm{~L}$ and $\mathrm{d} / 2$
2 $L / 2$ and $2 d$
3 L and d
4 $2 \mathrm{~L}$ and $\mathrm{d}$
Karnataka CET-2017
Current Electricity

152141 If the length of a wire is doubled its resistance becomes

1 2 times
2 4 times
3 3 times
4 unchanged
CG PET- 2012
Current Electricity

152143 Calculate the resistance of an aluminium wire of length $50 \mathrm{~cm}$ and cross- sectional area 2.0 $\mathrm{mm}^{2}$. The resistivity of aluminium is $\rho=2.6 \times 10^{-8} \Omega-m$

1 $0.0065 \Omega$
2 $0.065 \Omega$
3 $0.1265 \Omega$
4 None of these
CG PET- 2012
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Current Electricity

152139 Which of the following graph represents the variation of resistivity $(\rho)$ with temperature $(T)$ for copper?

1 a
2 b
3 c
4 d
NEET SEP-2020
Current Electricity

152140 A piece of copper is to be shaped into a conducting wire of maximum resistance. The suitable length and diameter are and respectively :

1 $2 \mathrm{~L}$ and $\mathrm{d} / 2$
2 $L / 2$ and $2 d$
3 L and d
4 $2 \mathrm{~L}$ and $\mathrm{d}$
Karnataka CET-2017
Current Electricity

152141 If the length of a wire is doubled its resistance becomes

1 2 times
2 4 times
3 3 times
4 unchanged
CG PET- 2012
Current Electricity

152143 Calculate the resistance of an aluminium wire of length $50 \mathrm{~cm}$ and cross- sectional area 2.0 $\mathrm{mm}^{2}$. The resistivity of aluminium is $\rho=2.6 \times 10^{-8} \Omega-m$

1 $0.0065 \Omega$
2 $0.065 \Omega$
3 $0.1265 \Omega$
4 None of these
CG PET- 2012
Join With Us for More Updates
Current Electricity

152139 Which of the following graph represents the variation of resistivity $(\rho)$ with temperature $(T)$ for copper?

1 a
2 b
3 c
4 d
NEET SEP-2020
Current Electricity

152140 A piece of copper is to be shaped into a conducting wire of maximum resistance. The suitable length and diameter are and respectively :

1 $2 \mathrm{~L}$ and $\mathrm{d} / 2$
2 $L / 2$ and $2 d$
3 L and d
4 $2 \mathrm{~L}$ and $\mathrm{d}$
Karnataka CET-2017
Current Electricity

152141 If the length of a wire is doubled its resistance becomes

1 2 times
2 4 times
3 3 times
4 unchanged
CG PET- 2012
Current Electricity

152143 Calculate the resistance of an aluminium wire of length $50 \mathrm{~cm}$ and cross- sectional area 2.0 $\mathrm{mm}^{2}$. The resistivity of aluminium is $\rho=2.6 \times 10^{-8} \Omega-m$

1 $0.0065 \Omega$
2 $0.065 \Omega$
3 $0.1265 \Omega$
4 None of these
CG PET- 2012
For More Updates join with Us