A recent development has found that the moon’s magnetic field has lasted for 1 billion years more than what was previously anticipated.
Geophysics is a branch of science in which we study about Earth in terms of its physical properties.
The behaviour of the needle of the magnetic compass under the influence of a magnet is said to have endlessly fascinated Einstein when he was a child.
A cyclotron is a kind of particle accelerator in which the charged particles are accelerated in an outward direction from centre while following a spiral path. It was invented by Ernest O. Lawrence in 1934 and he was honoured by the Nobel Prize in physics for this in 1939.
Invented by Ernest O. Lawrence, in 1934, cyclotron is a kind of particle accelerator (a machine which uses electromagnetic fields for propagation of charged particles to approx light speed and contain them in a well-defined beam) in which the charged particles get accelerated in an outward direction from the centre, following a spiral path.
This law was named after Jean-Baptiste Biot and Felix Savart in 1820. They derived the mathematical expression for the magnetic flux density.
We all are aware of revolutionary technology – visa debit and credit cards. Now similar cards are flooding the market. We swipe our card through the card swiping machine or card reader and our transaction is done. Super cool technology! Isn’t it? But have you ever wondered what is the technology used behind it? We all might have seen a black strip at the back of the card. This is a magnetic strip which produces electromagnetic induction and card reader uses this to determine the card details. Sounds interesting?
Galvanometer is an electromechanical device, an instrument, which is used to detect and measure electric current. They were also used as the analog measuring instruments (known as ammeters) to measure the direct flow of electric charge (current) that flows through an electric circuit.
The term ‘solenoid’ was given by Andre’-Marie Ampere, French physicist, to designate a helical coil. A solenoid is more commonly described as a coil which winded into a tightly packed helix. The coil’s length is greater than that of its diameter, wrapped around a metallic core, producing a uniform magnetic field in the volume of space whenever an electric current is passed through it.
Michael Faraday discovered electromagnetic induction in 1831 and published his results for the experiments.
For the experiment, he wrapped two wires around the opposite sides of an iron ring. He plugged one of the wires into a galvanometer and observed as he connected the other side of the wire to a battery. As expected (due to the discovered properties of electromagnets), he observed the wave of electricity (a transient current) to flow when he connected the wire to the battery and another one when he disconnected the wire to the battery. He explained the electromagnetic induction by using the concept of lines of force.