4. Find the resistance of 800 m of copper cable of cross- sectional area 20 mm². Take the resistivity of copper as 0.02 µm. [0.8 $2]

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Q: Question 10 Find the resistance in micro-ohms at 20 °C of an annealed copper bus bar 4.8 m in.…

A: Given, Wire length, l = 4.8 m Area, A=0.4 cm×3.6 cm=1.44 cm2 Resistivity, ρ=1.72×10-8 Ωm

Photoelectric

The photoelectric effect occurs when light (or similar incident radiation, including X-rays) falls on material together with a metal plate and causes it to emit electrons. The discovery of the photoelectric effect led to important new theories (and to a Nobel Prize for Albert Einstein). Photoelectric cells, or photocells, are utilized in burglar-alarm light detectors and garage-door openers (each employs a through-beam of light this is broken when something movements throughout it), and also to play soundtracks on film movies (in which a light beam shines through the soundtrack encoded at the film and is "read" with the aid of the photocells).