1. If the current in the inductor is double, by what factor does the stored ener

Question

1. If the current in the inductor is double, by what factor does the stored energy changed?

2. Why are primary and secondary coils of the transformer wrapped on an iron core that passes through both coils?

3. A charged particle moves in a straight line through a region of space. The magnetic field has a zero component parallel to the particle's velocity in that region. Why is this false?

4. The switch in the circuit shown in Figure below is closed, and the lightbulb glows steadily. The inductor is a simple air-core solenoid. An iron rod is inserted into the interior of the solenoid, increasing the magnitude of the magnetic field in the solenoid. As the rod is inserted, the brightness of the lightbulb _______.  



5. In an apparatus such as that in Figure below, suppose the black disk is replaced by one with hald the radius. Radiation pressure on the disk will be different after the disk is replaced. Explain why this is false.

Explanation / Answer

Solution-1) We know that

E = ½LI².

Therefore  if we double the energy in an inductor then we double the current,

And hence I is squared, thus the energy goes up by 2 squared

Therefore energy goes up by 4

2) It is done because to make sure that nearly all of the magnetic flux created by the primary passes through the secondary coil, and thus induces the current in the secondary when the current in the primary changes

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