Question

Write precautions to be taken in the experiment to verify the electric resistance depends on the area of
cross section of the material and write experimental procedure.​

Answer 1

*Answer:

*Aim :

To verify that resistance of a conductor is proportional to the length of the conductor for constant cross-section area and temperature.

*Procedure :

• Collect iron spokes of different lengths ; with same cross sectional areas.
• Make a circuit leaving gas between P and Q with a battery, ammeter and plug key.
• Connect one of the iron spoke say 10 cm length between P and Q.
• Measure the value of current using ammeter and note the value.
• Repeat this for other lengths of the iron spokes and note the corresponding values of currents.

*Observation :

You will observe that the current

decreases with increase in the length of the spoke.

Thus the resistance of each spoke increases with increase in the length for a constant potential difference.

*Conclusion:

From this, we conclude that the resistance of a conductor is directly proportional to its length (l) for constant cross-sectional area. Therefore, R∝L

We notice that the resistance was more when the cross - section area was less.

Therefore , R ∝ L/A

Thus we verify L and A.

$be \: brainly$

Answer 2

answer:

*Aim :

to verify that resistance of a conductor is proportional to the length of the conductor for constant cross-section area and temperature.

*Procedure :

collect iron spokes of different lengths ; with same cross sectional areas.

make a circuit leaving gas between p and q with a battery, ammeter and plug key.

connect one of the iron spoke say 10 cm length between p and q.

measure the value of current using ammeter and note the value.

repeat this for other lengths of the iron spokes and note the corresponding values of currents.

*Observation :

you will observe that the current

decreases with increase in the length of the spoke.

thus the resistance of each spoke increases with increase in the length for a constant potential difference.

*conclusion:

from this, we conclude that the resistance of a conductor is directly proportional to its length (l) for constant cross-sectional area. therefore, r∝l

we notice that the resistance was more when the cross - section area was less.

therefore , r ∝ l/a

PRECAUTIONS

1.note your observation carefully

2.connect the wires carefully