What are the factors affecting of strength of magnetic field?
Important Questions on Magnetism and Electromagnetism
The diagram below shows a magnetic needle kept just below the conductor AB which is kept in the North-South direction.
i) In which direction will the needle deflect when the key is closed?
ii) Why is the deflection produced?
iii) What will be the change in the deflection if the magnetic needle is taken just above the conductor AB?
iv) Name one device which works on this principle.
AB is a current-carrying conductor in the plane of the paper as shown in figure. What are the directions of magnetic fields produced by it at points P and Q? Given , where will the strength of the magnetic field will be larger?
Fleming's left-hand rule is used to find the direction of the magnetic field due to a straight current.
(a) State the rule to determine the direction of
(i) magnetic field produced around a straight conductor carrying current.
(ii) force experienced by current-carrying straight conductor placed in a magnetic field which is perpendicular to it.
(iii) current induced in a coil due to its rotation in a magnetic field.
(b) What is the function of an earth wire? Why is it necessary to earth metallic appliances?
State the rule to determine the direction of a magnetic field produced around a straight conductor carrying current.
A circular loop placed in a plane perpendicular to the plane of paper carries a current when the key is ON. The current as seen from points A and B (in the plane of paper and on the axis of the coil) is anti-clockwise and clockwise respectively. The magnetic field lines point from B to A. The N-pole of the resultant magnet is on the face close to
