In the above circuit diagram, in the place of AB the
following are connected, one by one and the
ammeter reading is noted.
i] Nichrome wire of length 'x cm and diametery om
ii) Nichrome wire of length 2x'cm and diameter y cm.
In which case the ammeter reading will be maximum? Why?
What happens to ammeter reading when a nichrome wire of length x cm but diameter 3
cm is connected in the place of AB?
Answers
We know that I = q/t
Also, q = n (e) i.e, charge is equal to integral multiple of charge of a electron. [ Quantisation Property of charge ]
Ok,
I = n (e) / t
So, More the length of wire More the nom of electrons flowing and More the value of Charge.
Hence, Ammeter reading is Maximum in nichrome wire of 2x cm.
when length of Nichrome wire X cm but 3cm of diameter is connected in place of AB, Then the value of ammeter reading remains constant as it was in wire of X cm with y cm of diameter.
Note - There will be some difference but in general that's very minute and Hence, Approximately it will be equal.
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Answer:
(i) The ammeter reading will decrease. This is because Resistance is directly proportional to the length; hence with the increase in the length the resistance of the wire will increase. So the current will decrease due to increase in the resistance (current is inversely proportional to the resistance).
(ii) The ammeter reading will increase because. R = ρ1A1A
Thus the resistance is inversely proportional to the area of the cross section, so with the increase in the area the resistance of the wire will decrease.
Therefore with the decrease in the resistance the current will increase (current is inversely proportional to the resistance).hence the ammeter reading will increase