SaraNextGen Study App [2023-24]
Last Updated On 01-06-2023 - By Jeesha Sara

A copper wire of length  and radius  is nickel plated till its final radius become  but length remains . If the resistivity of nickel and copper be  and  respectively, the conductance of the nickelled wire is

a)

b)

c)

d)


Question ID - 150322 :-

A copper wire of length  and radius  is nickel plated till its final radius become  but length remains . If the resistivity of nickel and copper be  and  respectively, the conductance of the nickelled wire is

a)

b)

c)

d)

1 Answer
5876 Votes
3537

Answer Key : (c) -

(c)

Resistance of copper part of wire  and

Resistance of nickel portion of wire

As these two resistances are in parallel, hence conductance

of the nickelled wire



Next Question :

Following figure shows cross-sections through three long conductors of the same length and material, with square cross-section of edge lengths as shown. Conductor  will fit snugly within conductor  and conductor  will fit snugly within conductor  Relationship between their end to end resistance is

a)

b)

c)

d)

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