The following four wires are made of the same material and are at the same temperature. Which one of them has highest electrical resistance :

1. Length = 50 cm, diameter = 0.5 mm

2. Length = 100 cm, diameter = 1 mm

3. Length = 200 cm, diameter = 2 mm

4. Length = 300 cm, diameter = 3 mm

The colour sequence in a carbon resistor is red, brown, orange and silver. The resistance of the resistor is 

1. 21 × 10³ ± 10%

2. 23 × 10¹ ± 10

3. 21 × 10³ ± 5%

4. 12 × 10³ ± 5%

The potential difference between points A and B of the adjoining figure is

1. $\frac{2}{3}V$

2. $\frac{8}{9}V$

3. $\frac{4}{3}V$

4. 2 V

Two resistors of resistance R₁ and R₂ having R₁ > R₂ are connected in parallel. For equivalent resistance R, the correct statement is :

1. $R>R_1+R_2$

2. $R_1<R<R_2$

3. $R_2<R<(R_1+R_2)$

4. R < R₁

A wire of resistance \(R\) is divided into \(10\) equal parts. These parts are connected in parallel, the equivalent resistance of such connection will be:
1. \(0.01R\)
2. \(0.1R\)
3. \(10R\)
4. \(100R\)

Three resistors each of 2 ohm are connected together in a triangular shape. The resistance between any two vertices will be 

1. 4/3 ohm

2. 3/4 ohm

3. 3 ohm

4. 6 ohm

There are n similar conductors each of resistance R. The resultant resistance comes out to be x when connected in parallel. If they are connected in series, the resistance comes out to be :

1. x/n²

2. n²x

3. x/n

4. nx

Equivalent resistance between A and B will be 

1. 2 ohm

2. 18 ohm

3. 6 ohm

4. 3.6 ohm

Referring to the figure below, the effective resistance of the network is 

1. 2r

2. 4r

3. 10r

4. 5r/2

Two resistances are joined in parallel whose resultant is $\frac{6}{8}$ ohm. One of the resistance wire is broken and the effective resistance becomes 2Ω. Then the resistance in ohm of the wire that got broken was 

1. 3/5

2. 2

3. 6/5

4. 3