Advertisements
Advertisements
प्रश्न
Resistance of a metal wire of length 5 m is 100 Ω . If the area of cross - section of the wire is `3 × 10^-7 "m"^2` , Calculate the resistivity of the metal .
Advertisements
उत्तर
R = 100 Ω
l = 5m
`A = 3 xx 10^-7 "m"^2`
`K = (rho l)/A` ⇒ `therefore rho = (RA)/l`
`δ = (100 xx 3 xx 10^-7)/5 = 60 xx 10^-7`
= `6 xx 10^-6 Omega-m`
APPEARS IN
संबंधित प्रश्न
On what factors does the resistance of a conductor depend?
Fill in the following blanks with suitable words:
Copper is a good .......... Plastic is an ..........
Distinguish between good conductors, resistors and insulators. Name two good conductors, two resistance and two insulators.
Classify the following into good conductors, resistors and insulators:
Rubber, Mercury, Nichrome, Polythene, Aluminium, Wood, Manganin, Bakelite, Iron, Paper, Thermocol, Metal coin
What is meant by the "resistance of a conductor" ? Write the relation between resistance, potential difference and current.
Which has more resistance:
a thick piece of nichrome wire or a thin piece?
How does the resistance of a conductor depend on:
area of cross-section of the conductor?
What would be the effect on the resistance of a metal wire of:
increasing its diameter?
The element used almost exclusively for filaments of incandescent lamps:
Plastic insulation surrounds a wire having diameter d and length l as shown above. A decrease in the resistance of the wire would be produced by an increase in the ______.
