Current Electricity — Physics STD 12 Science — Question

When electrons drift in a metal from lower to higher potential, does it mean that all the free electrons of the metal are moving in the same direction?

Answer the following questions regarding earth’s magnetism:
Geologists claim that besides the main magnetic N-S poles, there are several local poles on the earth’s surface oriented in different directions. How is such a thing possible at all?

Two converging lenses of unequal focal lengths can be used to reduce the aperture of a parallel beam of light without losing the energy of the light. This increases the intensity. Describe how the converging lenses should be placed to do this.

Express the power of a 100 watt bulb in CGS unit.

A rectangular brick is kept on a table with a part of its length projecting out. It remains at rest if the length projected is slightly less than half the total length but it falls down if the length projected is slightly more than half the total length. Give reason.

Two exactly identical 15 watt bulbs are placed very close to each other. Will they produce interference effects?

Is energy produced when a transformer steps up the voltage?

Is the electric field intensity a scalar or a vector quantity?