The coils of a transformer are wound on an iron core to increase magnetic flux linkage between the primary and secondary coils. Iron is a good conductor of magnetic fields, so it helps concentrate and guide the magnetic field efficiently, reducing energy losses and increasing the efficiency of the transformer.
Related Questions:
- Two parallel straight conductors carrying current in the same direction attract each other? Explain why. What will you conclude if the direction of current in conductors is opposite?
- Bar magnets are dropped in long pipes made up of plastic and copper (of the same length) simultaneously. The bar magnet comes out later through the copper pipe than through the plastic pipe. Why?
- What is the direction of rotation of the coil (shown in the figure) when the switch is closed? Label the diagram with the direction of forces forming a couple and the rotation of the coil.
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- Simple harmonic motion and waves-NFE
- Give an example of vibratory motion which is not simple harmonic motion. Give a reason for your selection.
- At the extreme position, velocity is zero but acceleration is maximum in simple harmonic motion. How can you theoretically explain it?
- What will happen to the acceleration of a mass-spring system if its mass is doubled?
- A simple pendulum has a time period “T”. What will happen to its time period if its thread length is shortened to half?
- A simple pendulum has a time period of 4 seconds. Will its time period remain the same or change if its steel bob is replaced by a wooden bob of the same size?
- Same masses are attached to different springs, one is vibrating faster. Why?
- A simple pendulum has a time period “T” in Murree. In Karachi, it has a different time period. What would you do to make its time period the same as it was in Murree?
- What will happen to the frequency of waves in a ripple tank if the time period of the electrical vibrator is decreased? What will happen to the wave speed?
- Why do water waves refract at the boundary of shallow water and deep water in a ripple tank experiment?
- Under what conditions are waves diffracted the most?
- What do you mean by oscillation? Define simple harmonic motion. What are the conditions for a body to perform SHM? Give examples of bodies that perform SHM.