FST 3
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TEST SERIES (PHYSICS FST)

266249 If the ratio of diameters, lengths and Young's modulus of steel and copper wires shown in the figure are \(a, b\) and \(c\) respectively, then the corresponding ratio of increase in their lengths would be:

1 \(\frac{2 a c}{b^2}\)
2 \(\frac{3 b}{2 a^2 c}\)
3 \(\frac{3 c}{2 a b^2}\)
4 \(\frac{2 a^2 c}{b}\)
**NCERT-XI-II-170
TEST SERIES (PHYSICS FST)

266250 Which one of the following is the property of a monochromatic, plane electromagnetic wave in free space:

1 Electric and magnetic fields have a phase difference of \(\pi / 2\)
2 They travel with a speed equal to \(\frac{1}{\sqrt{H_0 \varepsilon_0}}\)
3 The direction of propagation is in the direction of \(\overrightarrow{\mathrm{B}} \times \overrightarrow{\mathrm{E}}\)
4 \(E / B=1\)
**NCERT-XII-I-207**
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TEST SERIES (PHYSICS FST)

266249 If the ratio of diameters, lengths and Young's modulus of steel and copper wires shown in the figure are \(a, b\) and \(c\) respectively, then the corresponding ratio of increase in their lengths would be:

1 \(\frac{2 a c}{b^2}\)
2 \(\frac{3 b}{2 a^2 c}\)
3 \(\frac{3 c}{2 a b^2}\)
4 \(\frac{2 a^2 c}{b}\)
**NCERT-XI-II-170
TEST SERIES (PHYSICS FST)

266250 Which one of the following is the property of a monochromatic, plane electromagnetic wave in free space:

1 Electric and magnetic fields have a phase difference of \(\pi / 2\)
2 They travel with a speed equal to \(\frac{1}{\sqrt{H_0 \varepsilon_0}}\)
3 The direction of propagation is in the direction of \(\overrightarrow{\mathrm{B}} \times \overrightarrow{\mathrm{E}}\)
4 \(E / B=1\)
**NCERT-XII-I-207**
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