Question

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Answer 1

Answer:

yaa mate B one is correct ammeter will give more reading

Explanation:

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Answer 2

$\huge\star{\purple{\underline{\mathfrak{Question :-}}}}$

If a student while studying the dependence of current on the potential difference keeps the circuit closed for a long time to measure the current and potential difference, then:

(a) Ammeter’s zero error will change

(b) Ammeter’s will give more reading

(c) A voltmeter will show constantly higher readings

(d) The resistor will get heated up, and its value will change

$\huge\star{\green{\underline{\mathfrak{Answer :-}}}}$

(d) The resistor will get heated up, and its value will change

$\huge\star{\pink{\underline{\mathfrak{Explanation :-}}}}$

We know what is Ohm' s Law.

It states :-

At constant temperature and pressure, the potential difference of a circuit is directly proportional to the current passing through the circuit.

Therefore, V is proportional to I

OR

$V = IR$

Here, R is a proportionality constant which is actually called as resistance.

It's S.I. unit is Ohm.

We can write the equation as :-

$R = \dfrac {V}{I}$

Now, if a graph or table is drawn between the potential difference of the circuit and the current passing through the circuit.

We will be able to observe that the resistance is constant in all the situations that is whether the current and potential difference increases or decreases, the resistance remains the same.

Note :- The current can be measured with the help of ammeter which is connected in series in a circuit. The potential difference can be measured with the help of voltmeter which has to be connected in parallel to the resistance in a circuit.

Now, as the current flows for long time in the circuit, then offcourse the resistor will get heated up.

And because the resistor will get heated up, the resistance value will change.

This is because the temperature is different and hence the Ohm's law will not work here.

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