A permanent magnet

Related MCQs

• The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields
• When a magnet is in motion relative to a coil the induced e.m.f. does not depend upon
• The electromagnet has 50 turns and a current of 1A flows through the coil. If the length of the magnet circuit is 200 mm, what is the magnetic field strength ?
• A square cross-sectional magnet has a pole strength of 1 x 10 Wb and cross sectional area of 20 mm x 20 mm. What is the strength at a distance of 100 mm from the unit pole in air ?
• The most effective and quickest may of making a magnet from soft iron is by
• The bar magnet has
• Magnetism of a magnet can be destroyed by
• Permanent magnets are normally made of
• Those materials are well suited for making permanent magnets which have retentivity and coercivity.
• Hard steel is suitable for making permanent magnets because