Question

The potential difference between two points in an electric circuit is 9V. What does it mean?

Draw a circuit diagram of an electric circuit containing a cell, a
key, an ammeter, a resistor of 2Ω in series with a combination of
two resistors 4Ω each in parallel and a voltmeter across the
parallel combination. Will p.d. across the 2Ω resistor be the same
as that across the parallel combination of 4Ω resistors? Give
reason.


A wire of length L and resistance R is stretched so that its
length is doubled and the area of cross-section is halved. How
will its:
a) Resistance change? b) Resistivity change?

Justify your answer in each case.

Answer 1

Answer:

b resistance change mark me as branliest