A metal block has length 50 cm, breadth 30cm and thickness 20cm. When current passes  through it parallel to its length and parallel to its breadth, the ratio of maximum to minimum resistance of that block is

# A metal block has length 50 cm, breadth 30cm and thickness 20cm. When current passes  through it parallel to its length and parallel to its breadth, the ratio of maximum to minimum resistance of that block is

1. A

4: 25

2. B

25 : 4

3. C

25 : 9

4. D

9 : 25

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### Solution:

$=\frac{50}{600}×\frac{1500}{20}$

$=\frac{25}{4}$

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