Question

9. The length of the conducting wire of a circuit is doubled. The
current in the circuit will
বর্তনী এটাৰ পৰিবাহী তাঁৰডালৰ দৈর্ঘ্য দুগুন কৰা হ'ল। বর্তনীত প্ৰবাহৰ মান-
(a)Increase to double (দুগুনলৈ বৃদ্ধি পাব)
(b)Decrease to half of previous reading (আগৰ মানৰ আধা হ’ব)
(c) Decrease to % of the previous reading (আগৰ মানৰ% অংশ হব)
(d) Remain same (একে থাকিব)।
in
..
.
.please help​

Answer 1

Answer:

b- decrease to half of previous reading.

Explanation:

since resistance is directly proportional to the length of conductor,

thus, doubling the length means double resistance .

resistance is inversely proportional to current flowing in the circuit. thus....

the current will become half.

Answer 2

Answer:

Given:

The length of the conducting wire of a circuit is doubled.

To find:

Changes in the current.

Concept:

For any conducting wire, the resistance is given as :

$R = ( \rho \times \frac{l}{a} )$

As we increase the length of the wire to 2 times it's previous value, the resistance also increases to twice it's previous values .

Calculation:

We know that current is given by :

$i = \frac{V}{R}$

So if resistance becomes 2 times of its previous value, then

The current in the circuit will become ½ of its initial value.

So, option b) is correct.