Characteristics of the Earth’s Magnetic Field: The magnetic field lines of the earth resemble that of a hypothetical magnetic dipole located at the centre of the earth. The axis of dipole is presently tilted by approximately 11.3 degree with respect to the axis of the rotation of the earth. The pole near the geographic North […]
The Earth’s Magnetism: In 1600, Sir William Gilbert was the first to suggest that the Earth itself is a huge magnet. Earth behave as if a powerful magnet is placed within it. But this assumptions fails because temperature inside the earth is very high (more than Curie temperature). If there is any bar magnet inside
Magnetism and Gauss’ law: The net magnetic flux (∅B) through any closed surface is always zero. This law states that the number of magnetic field lines living any closed surface is always equal to the number of magnetic field lines entering it. Let a closed surface S is held in a uniform magnetic field
The Electrostatic Analog: The magnetic dipole moment of a bar magnet- M= m(2l), where, m = strength of the pole and 2l = length of dipole. The magnetic dipole is analogous to an electric dipole consisting of two equal charges of opposite sign(+- q) separated by 2a. Electric dipole moment P=q(2a) The equation for magnetic
Below are the list of all important algebraic formulas. 1. (a+b)² = a²+b²+2ab 2. (a-b)² = a²+b²-2ab 3. a²-b² = (a-b)(a+b) 4. (a+b)³= a³+b³+3ab(a+b) 5. (a-b)³= a³-b³-3ab(a-b) 6. a³+b³ = (a+b)(a²+b²-ab) 7. a³-b³ = (a-b)(a²+b²+ab) 8. (a+b+c)² = a²+b²+c²+2ab+2bc+2ca 9. a³+b³+c³-3abc = (a+b+c)(a²+b²+c²-ab-bc-ca)
Algebraic Formulas || Important Formulas of Algebra Read More »
There are many important formulas of laws of exponent but one of the most important formulas of laws of exponent are as under- 1. a⁰ = 1 2. (am)n = amn 3. am × an = am+n 4. am ÷ an = am–n 5. am × bm = (ab)m 6. am ÷ bm = (a÷b)m 7. 1÷a⁻¹ = a
Potential Energy of a Magnetic Dipole (bar magnet) in a Magnetic Field: We know that the magnitude of a torque acting on a dipole is- This torque tends to align the dipole in the direction of the field.The work to be done in rotating the dipole against the action of the magnetic torque. This work
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Torque on a Magnetic Dipole (bar magnet) in a Uniform Magnetic Field: Let a bar magnet is placed in a uniform magnetic field B. The length of the bar magnet is 2l and strength of each pole m. The magnet is held at angle theta with the direction of B. These equal and
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Bar Magnet as an Equivalent Solenoid: Magnetic field lines for a bar magnet and a current carrying solenoid Re resemble very closely. Therefore a bar magnet can be thought as a large number of circulating currents in analogy with a solenoid. Let i be the current passing through a solenoid, a be the radius
Magnetic Dipole: A magnetic dipole is an arrangement of two magnetic poles of equal and opposite strength separated by a small distance. Example– A bar magnet and a compass needle, etc. Magnetic Dipole Moment: Magnetic dipole moment is the product of the strength of either pole of the magnetic length of the magnet. It is
