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Two long straight parallel current-carrying conductors are kept ‘a’ distant apart in the air. The direction of current in both the conductors is the same. Find the magnitude of force per unit length and the direction of the force between them. Hence define one ampere.
Concept: Force Between Two Parallel Currents, the Ampere
The given figure shows a long straight wire of a circular cross-section (radius a) carrying steady current I. The current I is uniformly distributed across this cross-section. Calculate the magnetic field in the region r < a and r > a.
Concept: Ampere’s Circuital Law
An electron with angular momentum L moving around the nucleus has a magnetic moment given by ______.
Concept: Torque on a Rectangular Current Loop in a Uniform Magnetic Field >> The Magnetic Dipole Moment of a Revolving Electron
In what way is the behaviour of a diamagnetic material different from that of a paramagnetic, when kept in an external magnetic field?
Concept: Magnetic Properties of Materials
A charge 'q' is moved from a point A above a dipole of dipole moment 'p' to a point B below the dipole in equatorial plane without acceleration. Find the work done in the process.
Concept: Magnetic Dipole Moment of a Revolving Electron
How are the magnetic field lines different from the electrostatic field lines?
Concept: The Bar Magnet
Predict the polarity of the capacitor in the situation described below :
Concept: The Bar Magnet
A triangular loop of wire placed at abc is moved completely inside a magnetic field which is directed normal to the plane of the loop away from the reader to a new position a'b'c'. What is the direction of the current induced in the loop? Give reason.
Concept: Current Loop as a Magnetic Dipole: Magnetic Dipole Moment of Current Loop
Which of the following substances are diamagnetic?
Bi, Al, Na, Cu, Ca and Ni
Concept: Magnetic Properties of Materials
What are permanent magnets? Give one example ?
Concept: Permanent Magnet
Which of the following substances are para-magnetic?
Bi, Al, Cu, Ca, Pb, Ni
Concept: Magnetic Properties of Materials
The susceptibility of a magnetic material is − 2.6 × 10−5. Identify the type of magnetic material and state its two properties.
Concept: Magnetic Properties of Materials
The horizontal component of the earth’s magnetic field at a place is B and angle of dip is 60°. What is the value of vertical component of earth’s magnetic field at equator?
Concept: The Earth’s Magnetism
The relative magnetic permeability of a magnetic material is 800. Identify the nature of magnetic material and state its two properties.
Concept: Magnetic Properties of Materials
A magnetic needle, free to rotate in a vertical plane, orients itself vertically at a certain place on the Earth. What are the values of (i) Horizontal component of Earth’s magnetic field and (ii) angle of dip at this place?
Concept: The Earth’s Magnetism
What is the angle of dip at a place where the horizontal and vertical components of the Earth’s magnetic field are equal?
Concept: The Earth’s Magnetism
Where on the surface of Earth is the angle of dip zero?
Concept: The Earth’s Magnetism
A horizontal straight wire of length L extending from east to west is falling with speed v at right angles to the horizontal component of Earth’s magnetic field B.
(i) Write the expression for the instantaneous value of the e.m.f. induced in the wire.
(ii) What is the direction of the e.m.f.?
(iii) Which end of the wire is at the higher potential?
Concept: The Earth’s Magnetism
Write two characteristics of a material used for making permanent magnets ?
Concept: Permanent Magnet
Why is the core of an electromagnet made of ferromagnetic materials?
Concept: Permanent Magnet
