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The space surrounding a magnet in which magnetic force is exerted, is called a magnetic field. Magnetic field lines are the lines that are drawn at ev...

(i) Generator: The other devices are measuring instruments.

A fuse is a very important device used for protecting electric circuits. It is a wire made out of a metal like tin or tin alloy having a very low melt...

“D.C. generator” means “Direct Current generator”. That is, a D.C. generator produces direct current and not alternating current. We will now describe...

“A. C. generator” means “Alternating Current generator”. That is, an A.C. generator produces alternating current, which alternates (changes) in polari...

An electric motor converts electrical energy into mechanical energy. It works on the principle that - a current carrying conductor placed in a magneti...

A fuse wire is made of tin alloy because it has low melting point, so that it may melt easily, whereas a copper wire cannot be used as a fuse wire bec...

(i) If one of the appliances is switched off or gets fused, there is no effect on the other appliances and they keep on operating. (ii) The same vo...

If current always flows in the same direction, it is called a direct current. The current, which we get from the cell or a battery, is a direct curren...

The force acting on a current-carrying conductor placed in a magnetic field is, F = B × I × L The current I is the rate of flow of charge. Now, ...

Nipermag is an alloy of iron, nickel, aluminium and titanium. Permanent magnet of this alloy is more stronger than those made of ordinary steel. Hence...

Bar Magnets The bar magnet is a permanent magnet. It produces a comparatively weak force of attraction. The strength of a bar magnet cannot be c...

A soft iron core is placed inside a solenoid to make an electromagnet. When a soft iron core is placed inside a solenoid, then the strength of the mag...

The direction of lines of force of the magnetic field produced by a straight wire carrying current is obtained by Maxwell’s right hand thumb rule. Acc...

Earth’s magnetism is due to the magnetic effect of current which is flowing in the liquid core at the center of the earth.

If you hold the thumb, the forefinger and the centre finger of your right hand at right angles to one another. Adjust you hand in such a way that fore...

The magnetic lines of force do not intersect one another due to the fact that the resultant force on a north pole at any point can be only in one dire...

The elements of Earth’s magnetic field are angle of dip, declination and horizontal component of earth’s magnetic field.

Compass needle makes use of the directive property of a magnet.

Such a person should be provided with an insulated support of wood, plastic or rubber.