# (a) Yor are required to select a carbon resistor of resistance of $56k\Omega \pm 10$% from a shopkeeper. What would be the sequence of colour bands required to code the desired resistor?(b) Write two characteristic properties of the material of a meter bridge wire.(c) What precautions do you take to minimize the error in finding the unkown resistance of given wire?

(a) $56k\Omega \pm 10$%

5 stands for Green colour

6 stands for Blue colour

k implies $10^{3}$ and it stands for the orange colour

$\pm 10$% implies silver colour

The first two colours indicate two significant figures 5 and 6. The third colour indicates decimal multiplier and the last colour indicates tolerance.

(b) The material of meter bridge wire is manganin or constantan

The characteristic properties include :

• High specific resistance or resistivity
• Low-temperature coefficient of resistance

(c) To minimise error in finding the unknown resistance of the given wire, the precaution to be taken are:

• the balance point should lie between 30cm and 70cm
• clean the connecting wires and connecting points of the meter bridge properly with sandpaper.

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