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#12 | Ampere's Circuital Law: Solenoid & Toroid
(Physics) > Moving Charges and Magnetism

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Related Practice Questions :
What is a representation of the magnetic field caused by a straight conductor with a uniform cross-section and a steady current of radius \(a\)?
1.   2.
3. 4.
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A long straight wire of radius \(a\) carries a steady current \(I\). The current is uniformly distributed over its cross-section. The ratio of the magnetic fields \(B\) and \(B'\) at radial distances \(\frac{a}{2}\) and \(2a\) respectively, from the axis of the wire, is:
1. \(\frac{1}{2}\) 2. \(1\)
3. \(4\) 4. \(\frac{1}{4}\)
 58%
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NEET - 2016
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A cylindrical conductor of radius \(R\) is carrying a constant current. The plot of the magnitude of the magnetic field \(B\) with the distance \(d\) from the centre of the conductor is correctly represented by the figure:

1. 2.
3. 4.
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NEET - 2019
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Two toroids \(1\) and \(2\) have total no. of turns \(200\) and \(100\) respectively with average radii \(40~\text{cm}\) and \(20~\text{cm}\) respectively. If they carry the same current \(i,\) what will be the ratio of the magnetic fields along the two loops?
1. \(1:1\)
2. \(4:1\)
3. \(2:1\)
4. \(1:2\)

 79%
From NCERT
NEET - 2019
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