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प्रश्न
State any two causes of energy loss in actual transformers.
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उत्तर
Following are the two cause of energy loss:
- Iron loss: Loss in the bulk of iron core due to the induced eddy currents. It is minimised by using thin laminated core.
- Current flowing through the primary and secondary coils will generate heat. Low resistance copper wires is used to reduce this effect.
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संबंधित प्रश्न
Give one example of use of eddy currents.
How are eddy currents produced ?
If the magnetic field outside a copper box is suddenly changed, what happens to the magnetic field inside the box? Such low-resistivity metals are used to form enclosures which shield objects inside them against varying magnetic fields.
A metallic bob A oscillates through the space between the poles of an electromagnet (See the figure). The oscillations are more quickly damped when the circuit is on, as compared to the case when the circuit is off. Explain.
State applications of eddy currents.
The plane in which eddy currents are produced in a conductor is inclined to the plane of the magnetic field at an angle equal to ______.
A constant retarding force of50 N is applied to a body of mass 20 kg moving initially with a speed of 15 ms-1. How long does the body take to stop?
If the length of a simple pendulum increases by 5%, then its period shall increase by ______.
