Question

5) (a) State the law which gives a relation between potential difference and current in a circuit. Express it
mathematically.
(b) Name two factors on which resistivity of a substance depends and two factors on which it does not
depend.
(c) Calculate the resistance of a wire of length 300 m. and cross-sectional area 1 mm2 made of material
of resistivity 1.0 x 10-7 Ωm.

Answer 1

Explanation:

ohms law is at constant temperature the potential diffeeence between two points is directly praportional to the current passing through the 2 two points...present on the conductor..

Answer 2

Answer:

ohms law-if physical conditions are kept unchanged than potencial differance is directly propotional to the current in circuit

V=RA

v-potencial differance

R-constant of propotionality also called resistance

A-current

ii-resistivity depends upon temperature and nature of material

it does not depend upon length and area of substance.

iii-Resistance=resistivity.length/area

=(10.10-7.300/10-8)m

solve it and u will get the ans

hope this helps