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प्रश्न
Complete the following sentence :
On reserving the direction of current in a wire, the magnetic field produced by it gets _____.
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उत्तर
On reserving the direction of current in a wire, the magnetic field produced by it gets reversed.
संबंधित प्रश्न
The diagram shows a coil wound around a U shape soft iron bar AB.
1) What is the polarity induced at the ends A and B when the switch is pressed?
2) Suggest one way to strengthen the magnetic field in the electromagnet
3) What will be the polarities at A & B if the direction of current is reversed in the circuit?
How will you make an iron bar electromagnet? Draw a diagram showing the polarities of the electromagnet?
What is an electromagnet?
Why is soft iron generally used as the core of the electromagnet?
What is a permanent magnet? Give one use of it.
State the factors that can increase the speed of rotation of the coil in a D.C. 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.
What is dynomo (a.c. generator)? State the principle on which it works.
State the factors, on which depends the magnitude of the force acting on current carrying conductor, when it is kept in a magnetic field perpendicular to it.
Which magnet will you use?
Iron is to be separated from trash.
