# a 4 ohm resistance wire is doubled on it  calculate the new resistance of the wire

Dear Student,

In this query we consider wire double on it means to fold the length of wire. It means its length will get half and area of cross section will get double.

Let the resistance of the wire originally 'R' of length 'l' and area of cross-section 'A' with resistivity of material is 'ρ', Then

Now, for new arrangement,

• 131
It is surely correct . Thanls for giving answer.
• -12
th
• -16
Tq so much
• -13
Thank you
• -13
Thx
• -4
I don't umderstand by 'doubled on it' ..
• -14
• 5
R=p. l/A

• 49
• -9
Rubbish
• -10
123456789
123456789
123456789
0897645231

sdfghjkl;'
• -10
Andwer

• 20
A magnetic field is produced around a current carrying conductor which deflects the magnetic compass
• -4

• 26
Resistivity is the property of a material But resistance Is the Ratio of potential difference across a conductor through current flowing through it
• 5
Is sexual reproduction videos affecting children's?
• -12
Yes because after seeing that they are doing rape
• -5
Two different resistor when connected in series have equivalent resistance of 8 ohm and when connected in parallel then the equivalent is 2 ohm. Find details the resistance of each resistance.

• -2
hope it will help u

• 11
A 4ohm resistance wire is doubled on it. Calculate the new resistance of the wire.

• -3
p' = p

l' = l / 2

A' = 2A

Thus,

R' = p' l'/A' = p (l /2) ÷ 2A = !/4 (p l / A) = 1/4R = 1/4 × 4 = 1Ω.
• 6

• -1
Resistance becomes 1ohm
• -2
Length getting doubled means that length of wire gets halted , area of cross section gets doubled , therefore , l=l/2 A=2A R=PL/A NOW IF we solve it we get resistance as 1 ohm
• 0

• 1
those substances through which electricity does not flow is called insulator
• 0
• 1
All are lollollol
• 0
to flow of electron is called current
• 2
16 ohm
• 0
• 0

• 0
New resistance is new
• -1

• 0
nothing

• -1

• 1

• 1
nothing

• 2
Resistance will decrease
• 0

• 0
We know,
R=pl/a
Where R is resistance
P is resistivity
l is length
a is area of cross section

If resistance is doubled then
R'= 2(pl)/a where R' is a new resistance

R' = 2R
= 2*4 (as resistance is given 4 ohm)
= 8 ohm
Hence new resistance is 8 ohm
• -1
Length of wire is doubled (2l)
As we know that ,if length is double then the resistance is half.
Hence, l inversely proportional to The
So,2l = 1/2 ? 4
=2 ohm resistance .
Hope you understand.
But might be wrong
• 1
We know
P= RA/l

Now, initially we have -
R= 4 ohm
Area = A
Length = l
So,
P=4A /l -----------(1)

Now when wire get doubled then -
Length get half i.e l/2
Area of Cross - section get doubled i.e 2A
Resistance becomes R'
So,
P=R'2A/l/2
= 4R'A /l ---------- (2)
Now we know that resistivity of a wire never get affected by change in shape and size. So,
Eqn- (1) = Eqn- (2)

4A/l = 4 R'A/l
1 = R'
Hence new resistance is 1 ohm
• 1
We know,
P=RA/l
where p is resistivity
R is resistance
A is area of Cross section
l is length of conductor
Wire is of 4 ohm so,
Initially p= 4A /l

When wire is doubled then,
Length get halved i.e l/2
Area get doubled i.e 2A
Let new resistance be R's
So, p'= R'2A/l/2 = 4R'A/l

Now we know that resistivity of a same wire is not depends on resistance. So, if here resistance varies then it is not necessary that the resistivity also changes.
P' = P
4A / l = 4R'A/ l
R' = 1
Hence new resistance is 1 ohm
• 0
Resistance is directly proportional to length of wire
when length of wire is doubled then resistance will also double

• 0
Hope it is helpful for u

• 1
Expert didnt close conversation.
• 2

• 0

• 0
16 ohm
• 0
16ohm
• 0
One omh
• 0

• 0
4 = ?l/A

R' = ?(2l)/A = 2 ? ?l/A = 2 ? 4 = 8 ?

THIS IS TRUE ONLY IF WIRE IS NOT STRETCHED AND VOLUME CHANGES.
• 0
Can somebody help me in solving my question that I had asked
• 0
2ohm
• 0
A closed and continuous path of electric current is known as electric circuit
• 0

• 0
Dear Student,

In this query we consider wire double on it means to fold the length of wire. It means its length will get half and area of cross section will get double.

Let the resistance of the wire originally 'R' of length 'l' and area of cross-section 'A' with resistivity of material is '?', Then

?

Now, for new arrangement,

?
• 0
• 0
It's like adding up one more identical resistance in the series. Resistance will become 8 ohm.

• 0
electric current is a flow of electrons in a conductor
• 0
1/4 ohm
• 0

• 0
Half
• 0
I couldn't reach live class
• 0
Please tell what do in live class
• 0
Which time tomorrow live class
• 0
Electrical potential of point is defined as the amount of work done when unit positive charge is moved from infinitly number that point. Si unit of electric potential is volt.. It's symbol is "V"

Ok, understand
• 0
Resistance will be 1ohm
• 0
New resistance is 8ohms
• 0

• 0
8ohm
• 0
Ohm's law
• 0

• 0
define some electric symbol wire
• 0
Hello am Nitin

• 0
8 ohm
• 0
8 ohm
• 0
the dance maker Pamela
• 0
Kajal
• 0
Yes sir
• 0
Ohms law,v/l=r the resistance of a conductor can be defined as the ratio between the potential difference across the ends of the conductor and the current flowing throung it
• 0
Resistance=electrical current ampiar
Resistivity=voltage
• 0
who do you lived
• 0
photo
• 0

• 0
Ksjsklsnxnxmmx
• 0

• 0
Write two factors on which the internal resistance of cell depends
• 0
Resistance= (pl)/a

l=length of wire

a=area of wire

Wire is doubled so length will be doubled.

Let's assume R initial resistance..

R'= new resistance

R'=(2pl)/a

R'=2R

R'=2*4=8 ohm

New resistance is 8 ohm
• 0
Kkll
• 0
Bjqk
• 0
Chandni

• 0
1ohm
• 0
cell biology and Biotechnology
• 0