Why is tungsten suitable for making the filament of a bulb ?

Write the reletion between resistance R of the filament of a bulb, its power and a constant voltage V applied across it.

Assertion: Through the same current flows through the line wires and the filament of the bulb but heat produced in the filament is much higher than that in line wires. Reason: The filament of bulbs is made of a material of high resistance and high melting point.

Why is the tungsten used almost exclusively for filament of electric lamps? Explain.

If the current in an electric bulb increases by 1 %, what will be the change in the power of a bulb ? [Assume that the resistance of the filament of a bulh remains constant]

Which of following is suitable for making permanent magnet ?

Why is much less heat generated in long electric cables than in the filament of an electric bulb?

Why is lead-tin alloy used for making a fuse?

Actin is present in thin filament

Why steel is suitable to make permanent magnet?