01. Ohm's Law, Resistance, Conductivity and Thermal Dependency of Resistance
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Current Electricity

151936 A wire $X$ is half the diameter and half the length of a wire $Y$ of similar material. The ratio of resistance of $\mathrm{X}$ to that of $\mathrm{Y}$ is

1 $8: 1$
2 $4: 1$
3 $2: 1$
4 $1: 1$
BITSAT-2014
Current Electricity

151937 Two resistance at $0^{\circ} \mathrm{C}$ with temperature coefficient of resistance $\alpha_{1}$ and $\alpha_{2}$ joined in series act as a single resistance in a circuit. The temperature coefficient of their single resistance will be

1 $\alpha_{1}+\alpha_{2}$
2 $\frac{\alpha_{1} \alpha_{2}}{\alpha_{1}+\alpha_{2}}$
3 $\frac{\alpha_{1}-\alpha_{2}}{2}$
4 $\frac{\alpha_{1}+\alpha_{2}}{2}$
BITSAT-2016
Current Electricity

151939 A rod of a certain metal is $1.0 \mathrm{~m}$ long and 0.6 $\mathrm{cm}$ in diameter. Its resistance is $3.0 \times 10^{-3} \Omega$. Another disc made of the same metal is $2.0 \mathrm{~cm}$ in diameter and $1.0 \mathrm{~mm}$ thick. What is the resistance between the round faces of the disc?

1 $1.35 \times 10^{-8} \Omega$
2 $2.70 \times 10^{-7} \Omega$
3 $4.05 \times 10^{-6} \Omega$
4 $8.10 \times 10^{-5} \Omega$
UPSEE - 2012
Current Electricity

151941 An electric current passes through a circuit containing two wires of the same material connected in parallel. If the lengths of the wires are in the ratio of $4 / 3$ and radius of the wires are in the ratio of $2 / 3$, then the ratio of the currents passing through the wires will be

1 3
2 $1 / 3$
3 $8 / 9$
4 None of these
UPSEE - 2008
NEET DIGITAL LIBRARY
Current Electricity

151936 A wire $X$ is half the diameter and half the length of a wire $Y$ of similar material. The ratio of resistance of $\mathrm{X}$ to that of $\mathrm{Y}$ is

1 $8: 1$
2 $4: 1$
3 $2: 1$
4 $1: 1$
BITSAT-2014
Current Electricity

151937 Two resistance at $0^{\circ} \mathrm{C}$ with temperature coefficient of resistance $\alpha_{1}$ and $\alpha_{2}$ joined in series act as a single resistance in a circuit. The temperature coefficient of their single resistance will be

1 $\alpha_{1}+\alpha_{2}$
2 $\frac{\alpha_{1} \alpha_{2}}{\alpha_{1}+\alpha_{2}}$
3 $\frac{\alpha_{1}-\alpha_{2}}{2}$
4 $\frac{\alpha_{1}+\alpha_{2}}{2}$
BITSAT-2016
Current Electricity

151939 A rod of a certain metal is $1.0 \mathrm{~m}$ long and 0.6 $\mathrm{cm}$ in diameter. Its resistance is $3.0 \times 10^{-3} \Omega$. Another disc made of the same metal is $2.0 \mathrm{~cm}$ in diameter and $1.0 \mathrm{~mm}$ thick. What is the resistance between the round faces of the disc?

1 $1.35 \times 10^{-8} \Omega$
2 $2.70 \times 10^{-7} \Omega$
3 $4.05 \times 10^{-6} \Omega$
4 $8.10 \times 10^{-5} \Omega$
UPSEE - 2012
Current Electricity

151941 An electric current passes through a circuit containing two wires of the same material connected in parallel. If the lengths of the wires are in the ratio of $4 / 3$ and radius of the wires are in the ratio of $2 / 3$, then the ratio of the currents passing through the wires will be

1 3
2 $1 / 3$
3 $8 / 9$
4 None of these
UPSEE - 2008
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Current Electricity

151936 A wire $X$ is half the diameter and half the length of a wire $Y$ of similar material. The ratio of resistance of $\mathrm{X}$ to that of $\mathrm{Y}$ is

1 $8: 1$
2 $4: 1$
3 $2: 1$
4 $1: 1$
BITSAT-2014
Current Electricity

151937 Two resistance at $0^{\circ} \mathrm{C}$ with temperature coefficient of resistance $\alpha_{1}$ and $\alpha_{2}$ joined in series act as a single resistance in a circuit. The temperature coefficient of their single resistance will be

1 $\alpha_{1}+\alpha_{2}$
2 $\frac{\alpha_{1} \alpha_{2}}{\alpha_{1}+\alpha_{2}}$
3 $\frac{\alpha_{1}-\alpha_{2}}{2}$
4 $\frac{\alpha_{1}+\alpha_{2}}{2}$
BITSAT-2016
Current Electricity

151939 A rod of a certain metal is $1.0 \mathrm{~m}$ long and 0.6 $\mathrm{cm}$ in diameter. Its resistance is $3.0 \times 10^{-3} \Omega$. Another disc made of the same metal is $2.0 \mathrm{~cm}$ in diameter and $1.0 \mathrm{~mm}$ thick. What is the resistance between the round faces of the disc?

1 $1.35 \times 10^{-8} \Omega$
2 $2.70 \times 10^{-7} \Omega$
3 $4.05 \times 10^{-6} \Omega$
4 $8.10 \times 10^{-5} \Omega$
UPSEE - 2012
Current Electricity

151941 An electric current passes through a circuit containing two wires of the same material connected in parallel. If the lengths of the wires are in the ratio of $4 / 3$ and radius of the wires are in the ratio of $2 / 3$, then the ratio of the currents passing through the wires will be

1 3
2 $1 / 3$
3 $8 / 9$
4 None of these
UPSEE - 2008
For More Updates join with Us
Current Electricity

151936 A wire $X$ is half the diameter and half the length of a wire $Y$ of similar material. The ratio of resistance of $\mathrm{X}$ to that of $\mathrm{Y}$ is

1 $8: 1$
2 $4: 1$
3 $2: 1$
4 $1: 1$
BITSAT-2014
Current Electricity

151937 Two resistance at $0^{\circ} \mathrm{C}$ with temperature coefficient of resistance $\alpha_{1}$ and $\alpha_{2}$ joined in series act as a single resistance in a circuit. The temperature coefficient of their single resistance will be

1 $\alpha_{1}+\alpha_{2}$
2 $\frac{\alpha_{1} \alpha_{2}}{\alpha_{1}+\alpha_{2}}$
3 $\frac{\alpha_{1}-\alpha_{2}}{2}$
4 $\frac{\alpha_{1}+\alpha_{2}}{2}$
BITSAT-2016
Current Electricity

151939 A rod of a certain metal is $1.0 \mathrm{~m}$ long and 0.6 $\mathrm{cm}$ in diameter. Its resistance is $3.0 \times 10^{-3} \Omega$. Another disc made of the same metal is $2.0 \mathrm{~cm}$ in diameter and $1.0 \mathrm{~mm}$ thick. What is the resistance between the round faces of the disc?

1 $1.35 \times 10^{-8} \Omega$
2 $2.70 \times 10^{-7} \Omega$
3 $4.05 \times 10^{-6} \Omega$
4 $8.10 \times 10^{-5} \Omega$
UPSEE - 2012
Current Electricity

151941 An electric current passes through a circuit containing two wires of the same material connected in parallel. If the lengths of the wires are in the ratio of $4 / 3$ and radius of the wires are in the ratio of $2 / 3$, then the ratio of the currents passing through the wires will be

1 3
2 $1 / 3$
3 $8 / 9$
4 None of these
UPSEE - 2008
NEET DIGITAL LIBRARY