let a current of 4 a is flowing thru a winding on a toroidal core. the perimeter of the core is 20 cm. the surface area of the core is 100 m2. number of wingings is also 100. calculate the magnetic field instensity in this core.

The magnetic field intensity in this core is 2000.Solution:Current I = 4APerimeter s = 20cm=20x10² mArea A = 100 m²N = 100Magnetic field intensityH = NI/S = 100×4 20×10-²H=2000 A-T/m= 2000The strength of the magnetic field is 25 Gauss or 50 times stronger than the surface magnetic field and it aligns compass needles north-south. It is represented as vector H and is defined as the ratio of MMF required to produce a given magnetic flux density in a given material per unit length of that material.The core of the Earth is also an electromagnet. The crust is solid, but the Earth's core is surrounded by a molten iron-nickel mixture. The Earth's magnetic field is caused by currents flowing through the molten core. The magnetism of the Earth's core is based on the electrical conductivity of the liquid metals it contains. Magnetic fields are probably created according to the so-called geodynamo model. The movement of the molten core creates electrical currents.Learn more about The magnetic field here:-https://brainly.com/question/26730557#SPJ4