Question

33. Two metallic wires made from copper have
same length but the radius of wire 1 is half of
that of wire 2. The resistance of wire 1 is R.
If both the wires are joined together in series,
the total resistance becomes
R
A 2R
B
2
C.
R
D
R​

Answer 1

Answer:

5R/4

Explanation:

So, resistance of Wire 2 is R/4 as radius is half of wire 1, so area would be 4 times of wire 1.

Now for resistance in series. R = R1 + R2.

Therefore, Final R = R + R/4 = 5R/4