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A circular current-carrying coil has a radius R. The distance from the centre of the coil on the axis of the coil, where the magnetic induction is 18th of its value at the centre of the coil is

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Important Questions on Moving Charges and Magnetism

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Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 77
A thin insulated wire forms a plane spiral of N=100 tight turns carrying a current I=8 mA  (milliampere). The radii of inside and outside turns are a=50 mm and b=100 mm respectively. The magnetic induction at the centre of the spiral is
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Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 78
A current I flowing through the loop as shown in the adjoining figure. The magnetic field at centre O is


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Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 79
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 a2 and 2 a respectively, from the axis of the wire is
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Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 80

Ampere's law is analogous to

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Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 81
The imaginary closed loop around a current carrying conductor which is applicable in ampere's circuital law is known as:
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Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 82
Assertion: Ampere's circuital law holds for steady currents which do not fluctuate with time.
Reason: Ampere's circuital law is similar to that of Biot-Savart law.
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Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 83
In a coaxial straight cable, the central conductor and the outer conductor carry equal currents in opposite directions. The magnetic field is zero
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Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 84
A cylindrical conductor having radius of cross section R carries a steady current I . If the distance from the axis of the conductor is r, then the magnetic field B varies as