The wire of flash bulbs is made up of A. Mg B. Ba C. Cu D. Ag

The correct answer is A. Mg.

The wire of flash bulbs is made of magnesium because it is a highly flammable metal that burns with a bright light.

When the flash bulb is triggered, a small amount of electricity is passed through the magnesium wire, causing it to ignite and produce a bright flash of light.

Magnesium is a good choice for this application because it is relatively inexpensive, easy

to work with, and has a high ignition temperature. It is also a relatively safe material to use, as it does not produce toxic fumes when it burns.

The other options are not as good choices for the wire of flash bulbs. Barium is a heavy metal that is not flammable. Copper is a good conductor of electricity, but it does not burn with a bright light. Silver is a precious metal that is too expensive to use in flash bulbs.

In conclusion, the wire of flash bulbs is made of magnesium because it is a highly flammable metal that burns with a bright light.