Advertisements
Advertisements
Question
For wiring in the home, one uses Cu wires or Al wires. What considerations are involved in this?
Solution
For the selection of metal for wiring in home, the main criterion is the availability, conductivity and cost of the metal.
The Cu wires or Al wires are used for wiring in the home. The main considerations involved in this process are cost of metal and good conductivity of the metal.
APPEARS IN
RELATED QUESTIONS
A charge Q is distributed uniformly over a metallic sphere of radius R. Obtain the expressions for the electric field (E) and electric potential (V) at a point 0 < x < R.
Show on a plot the variation of E and V with x for 0 < x < 2R.
Three concentric metallic shells A, B and C or radii a, b and c (a < b < c) have surface charge densities + σ, −σ and + σ, respectively as shown in the figure
If shells A and C are at the same potential, then obtain the relation between the radii a, b and c.
In an electric circuit containing a battery, the charge (assumed positive) inside the battery ____________ .
Sunita and her friends visited the exhibition. The policeman asked them to pass through a metal detector. Sunita's friends were initially scared of it. Sunita, however, explained to them the purpose and working of the metal detector.
Answer the following questions :
(a) On what principle does a metal detector work?
(b) Why does the detector emit a sound when a person carrying any metallic object walks through it?
(c) State any two qualities which Sunita displayed while explaining the purpose of walking through the detector.
A constant voltage is applied between the two ends of a uniform metallic wire. Some heat is developed in it. The heat developed is doubled if ______.
If the resistivity of an alloy is P and that of constitute metal is P1 then
A steady current of 1 A is flowing through the conductor. The number of electrons flowing through the cross-section of the conductor in 1 second is ______
An electric current (I) flowing through a metallic wire is gradually increased. The graph of heating power (P) developed in it versus the current (I) is ______.
Current I flowing through a metallic wire is gradually increased. Show graphically how heating power (P) developed in it varies with the current (I).
