Magnetic Field produced by Electric Curent
Magnetic Field produced by Electric Current
An electric current flowing through a conductor produces magnetic field. This was first observed by in 1820 by a Danish physicist Hans Christian Oersted. It is said that he was demostrating an experiment to show heating effect of electric current. He noticed that each time he switched on the current a magnetic compass placed near the circuit showed a deflection, which led to the first connection between electricity and magnetism.
Electrons inside an atom are in rotational motion around the nucleus as shown in the figure. It is equivalent to a current loop. Hence atom as a whole consists of many tiny magnets. The magnetic properties of atoms are dependent on the direction of motion of electrons.
Which of the following are correct : (a) Danish physicist Hans Christian Oersted concluded that an electric field cannot be produced without charge but magnetic field can be produced without magnet. (b) The electron while rotating around the nucleus also revolve around their own axis similar to the motion of the Earth around the Sun and round its own axis. (c) An electric current flowing through a conductor produces magnetic field. | |||
| Right Option : D | |||
| View Explanation | |||
Arrange the following steps in sequential order to demonstrate the magnetic effect of the electric current using magnetic compass. (A) Wind an insulated conducting wire around the magnetic compass such that the axis of the coil is directed along east-west direction and connect the free ends of the wire to a cell through a switch. (B) Take a magnetic compass. (C) When current flows through the conducting wire, it behaves as a magnet and deflects the compass needle. (D) ABCDWhen the switch is closed, the magnetic needle in the compass deflects from its initial position and when the switch is opened, the needle comes back to its initial position. | |||
| Right Option : C | |||
| View Explanation | |||
Which of the following are correct : (a) Danish physicist Hans Christian Oersted noticed that each time he switched on the current a magnetic compass placed near the circuit showed a deflection. (b) An electric current flowing through a conductor produces magnetic field. | |||
| Right Option : C | |||
| View Explanation | |||
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