Advertisements
Advertisements
प्रश्न
State the condition when an electric charge can give rise to a magnetic field.
Advertisements
उत्तर
When an electric charge flows in a conductor, a magnetic field is produced around it.
संबंधित प्रश्न
How will you make an iron bar electromagnet? Draw a diagram showing the polarities of the electromagnet?
Show with the aid of a diagram how a wire is wound on a U-shaped piece of soft iron in order to make it an electromagnet. Complete the circuit diagram and label the poles of the electromagnet.
Fill in the blanks by writing (i) Only soft iron, (ii) Only steel, (iii) Both soft-iron and steel for the material of core and/or magnet.
Electric bell ______.
Complete the following sentence :
On reserving the direction of current in a wire, the magnetic field produced by it gets _____.
State two factors on which the magnitude of an induced e.m.f. in the secondary coils of a transformer depends.
State three factors which govern the speed of rotation of an electric motor.
State the position of armature coil relative to the direction of magnetic field, in a D. C. motor when the deflecting couple acting an the coil is maximum.
State important properties (or characteristics) of magnetic lines of force around a straight conductor.
State and explain Maxwell’s Cork Screw Rule.
Which magnet will you use?
Iron is to be separated from trash.
