Magnetism 4 Electromagnets
... Discovered that an electric current causes a magnetic field How? Connected a series circuit and turned on the power. A nearby compass moved! ...
... Discovered that an electric current causes a magnetic field How? Connected a series circuit and turned on the power. A nearby compass moved! ...
VOICE OVER FOR TLM for Project 5 - Class CBSE
... calculate the magnetic induction ‘dB’ at point P due to one such element of the current-carrying conductor. Then, to obtain the magnetic induction due to all the elements of the conductor, we calculate the sum of the magnetic inductions due to all the elements at point P. ...
... calculate the magnetic induction ‘dB’ at point P due to one such element of the current-carrying conductor. Then, to obtain the magnetic induction due to all the elements of the conductor, we calculate the sum of the magnetic inductions due to all the elements at point P. ...
Electromagnetism - Lecture 15 Waves in Conductors
... A metallic surface is a good reflector of electromagnetic waves. The reflection reverses the direction of the Poynting vector N = E × H which measures energy flux There is a radiation pressure on a conducting surface: ...
... A metallic surface is a good reflector of electromagnetic waves. The reflection reverses the direction of the Poynting vector N = E × H which measures energy flux There is a radiation pressure on a conducting surface: ...
Generator and Transformer
... large distances? How much power is wasted when 10000W of power is transmitted along a cable with a resistance of 1 at 200V? What would be lost if transmitted at 2000V instead? Much less lost when travels at a higher V and lower I ...
... large distances? How much power is wasted when 10000W of power is transmitted along a cable with a resistance of 1 at 200V? What would be lost if transmitted at 2000V instead? Much less lost when travels at a higher V and lower I ...
Lecture 5
... single loop or wire is such that the loop will behave like a magnet or compass needle and swing until it is perpendicular to a line running from the north magnetic pole to the south. The magnetic field about a current-carrying conductor can be visualized as encircling the conductor. The direction of ...
... single loop or wire is such that the loop will behave like a magnet or compass needle and swing until it is perpendicular to a line running from the north magnetic pole to the south. The magnetic field about a current-carrying conductor can be visualized as encircling the conductor. The direction of ...
Tutorial 3 Magnetostatics
... Magnetic Flux Density Q4. A charge 1.8 x 10-19 C is moving with a speed of 1 x 106 m/s through a magnetic field. The magnetic flux density with 3.5 T experiences a magnetic force of magnitude 2x10-13 N. Determine the angle between the magnetic field and proton’s velocity? Biot- Savart Law Q5. The me ...
... Magnetic Flux Density Q4. A charge 1.8 x 10-19 C is moving with a speed of 1 x 106 m/s through a magnetic field. The magnetic flux density with 3.5 T experiences a magnetic force of magnitude 2x10-13 N. Determine the angle between the magnetic field and proton’s velocity? Biot- Savart Law Q5. The me ...
Skin effect
Skin effect is the tendency of an alternating electric current (AC) to become distributed within a conductor such that the current density is largest near the surface of the conductor, and decreases with greater depths in the conductor. The electric current flows mainly at the ""skin"" of the conductor, between the outer surface and a level called the skin depth. The skin effect causes the effective resistance of the conductor to increase at higher frequencies where the skin depth is smaller, thus reducing the effective cross-section of the conductor. The skin effect is due to opposing eddy currents induced by the changing magnetic field resulting from the alternating current. At 60 Hz in copper, the skin depth is about 8.5 mm. At high frequencies the skin depth becomes much smaller. Increased AC resistance due to the skin effect can be mitigated by using specially woven litz wire. Because the interior of a large conductor carries so little of the current, tubular conductors such as pipe can be used to save weight and cost.