FST 9
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TEST SERIES (PHYSICS FST)

266592 Young's modules of material of a wire of length \(\mathrm{L}^{\prime}\) and across-sectional area \(A\) is Y . If the length of the wire is doubled and cross-sectional area is halved then Young's modules will be:

1 \(4 Y\)
2 \(2 Y\)
3 \(\frac{Y}{4}\)
4 \(Y\)
TEST SERIES (PHYSICS FST)

266593 In a meter bridge experiment null point is obtained at 20 cm from one end of wire when resistance \(X\) is balanced against another resistance \(Y\). If \(Y>X\) then where will be the new position of null point from the same end if one decides to balance a resistance of \(4 X\) against \(Y\) :

1 50 cm
2 80 cm
3 40 cm
4 70 cm
TEST SERIES (PHYSICS FST)

266594 Magnetic field at point ' P ' due to both infinite long current carrying wires is :

1 \(\frac{\mu_0}{2 \pi} \otimes\)
2 \(\frac{\mu_0}{2 \pi} \odot\)
3 \(\frac{5 \mu_0}{6 \pi} \otimes\)
4 \(\frac{7 \mu_0}{6 \pi} \otimes\)
TEST SERIES (PHYSICS FST)

266595 A metallic wire is folded to form a square loop of side a. It carries a current 'i' and is kept perpendicular to a uniform field. If the shape of loop is charged from square to a circle without changing the length of the wire and current the amount of work done in doing so is :

1 iB \(a^2(\pi+2)\)
2 \(\mathrm{iB} \mathrm{a}^2(\pi-2)\)
3 \(\mathrm{iBa}^2\left(\frac{4}{\pi}-1\right)\)
4 \(\mathrm{iBa}^2\left(1-\frac{4}{\pi}\right)\)
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TEST SERIES (PHYSICS FST)

266592 Young's modules of material of a wire of length \(\mathrm{L}^{\prime}\) and across-sectional area \(A\) is Y . If the length of the wire is doubled and cross-sectional area is halved then Young's modules will be:

1 \(4 Y\)
2 \(2 Y\)
3 \(\frac{Y}{4}\)
4 \(Y\)
TEST SERIES (PHYSICS FST)

266593 In a meter bridge experiment null point is obtained at 20 cm from one end of wire when resistance \(X\) is balanced against another resistance \(Y\). If \(Y>X\) then where will be the new position of null point from the same end if one decides to balance a resistance of \(4 X\) against \(Y\) :

1 50 cm
2 80 cm
3 40 cm
4 70 cm
TEST SERIES (PHYSICS FST)

266594 Magnetic field at point ' P ' due to both infinite long current carrying wires is :

1 \(\frac{\mu_0}{2 \pi} \otimes\)
2 \(\frac{\mu_0}{2 \pi} \odot\)
3 \(\frac{5 \mu_0}{6 \pi} \otimes\)
4 \(\frac{7 \mu_0}{6 \pi} \otimes\)
TEST SERIES (PHYSICS FST)

266595 A metallic wire is folded to form a square loop of side a. It carries a current 'i' and is kept perpendicular to a uniform field. If the shape of loop is charged from square to a circle without changing the length of the wire and current the amount of work done in doing so is :

1 iB \(a^2(\pi+2)\)
2 \(\mathrm{iB} \mathrm{a}^2(\pi-2)\)
3 \(\mathrm{iBa}^2\left(\frac{4}{\pi}-1\right)\)
4 \(\mathrm{iBa}^2\left(1-\frac{4}{\pi}\right)\)
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TEST SERIES (PHYSICS FST)

266592 Young's modules of material of a wire of length \(\mathrm{L}^{\prime}\) and across-sectional area \(A\) is Y . If the length of the wire is doubled and cross-sectional area is halved then Young's modules will be:

1 \(4 Y\)
2 \(2 Y\)
3 \(\frac{Y}{4}\)
4 \(Y\)
TEST SERIES (PHYSICS FST)

266593 In a meter bridge experiment null point is obtained at 20 cm from one end of wire when resistance \(X\) is balanced against another resistance \(Y\). If \(Y>X\) then where will be the new position of null point from the same end if one decides to balance a resistance of \(4 X\) against \(Y\) :

1 50 cm
2 80 cm
3 40 cm
4 70 cm
TEST SERIES (PHYSICS FST)

266594 Magnetic field at point ' P ' due to both infinite long current carrying wires is :

1 \(\frac{\mu_0}{2 \pi} \otimes\)
2 \(\frac{\mu_0}{2 \pi} \odot\)
3 \(\frac{5 \mu_0}{6 \pi} \otimes\)
4 \(\frac{7 \mu_0}{6 \pi} \otimes\)
TEST SERIES (PHYSICS FST)

266595 A metallic wire is folded to form a square loop of side a. It carries a current 'i' and is kept perpendicular to a uniform field. If the shape of loop is charged from square to a circle without changing the length of the wire and current the amount of work done in doing so is :

1 iB \(a^2(\pi+2)\)
2 \(\mathrm{iB} \mathrm{a}^2(\pi-2)\)
3 \(\mathrm{iBa}^2\left(\frac{4}{\pi}-1\right)\)
4 \(\mathrm{iBa}^2\left(1-\frac{4}{\pi}\right)\)
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TEST SERIES (PHYSICS FST)

266592 Young's modules of material of a wire of length \(\mathrm{L}^{\prime}\) and across-sectional area \(A\) is Y . If the length of the wire is doubled and cross-sectional area is halved then Young's modules will be:

1 \(4 Y\)
2 \(2 Y\)
3 \(\frac{Y}{4}\)
4 \(Y\)
TEST SERIES (PHYSICS FST)

266593 In a meter bridge experiment null point is obtained at 20 cm from one end of wire when resistance \(X\) is balanced against another resistance \(Y\). If \(Y>X\) then where will be the new position of null point from the same end if one decides to balance a resistance of \(4 X\) against \(Y\) :

1 50 cm
2 80 cm
3 40 cm
4 70 cm
TEST SERIES (PHYSICS FST)

266594 Magnetic field at point ' P ' due to both infinite long current carrying wires is :

1 \(\frac{\mu_0}{2 \pi} \otimes\)
2 \(\frac{\mu_0}{2 \pi} \odot\)
3 \(\frac{5 \mu_0}{6 \pi} \otimes\)
4 \(\frac{7 \mu_0}{6 \pi} \otimes\)
TEST SERIES (PHYSICS FST)

266595 A metallic wire is folded to form a square loop of side a. It carries a current 'i' and is kept perpendicular to a uniform field. If the shape of loop is charged from square to a circle without changing the length of the wire and current the amount of work done in doing so is :

1 iB \(a^2(\pi+2)\)
2 \(\mathrm{iB} \mathrm{a}^2(\pi-2)\)
3 \(\mathrm{iBa}^2\left(\frac{4}{\pi}-1\right)\)
4 \(\mathrm{iBa}^2\left(1-\frac{4}{\pi}\right)\)
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