Question

2. Lata took a wire of length 10 cm Manu took a wire of 5 cm of the same material and thickness.
Both of them connected the wires as shown in the circuit given in Figure 14.4. The current
flowing in both the circuits is the same.
(i) Will the heat produced in both the cases be equal? Explain
(ii) Will the heal produced be the same if the wires taken by them are of equal lengths but of
different thickness? Explain.

3. How does the magnetic effect of electric current help in the working of an electric bell? Explain
with the help of a diagram.
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Answer 1

Answer:

I) no 2) no

Explanation:

because heating length of wire be more.

2) because gain more energy for heating due to more thickness.

Answer 2

Answer:

Explanation:

2. i) H= I²RT

H ∝ R

R∝ L/A

Where L is the length of the wire.

Then,

H ∝ R ∝ L

When the length of the wire increases, the heat produced will also be increased.

Therefore, heat produced in both the cases will not be the same.

Heat produced in the 10 cm wire is more than the heat produced in the 5 cm wire.

ii)No.

H ∝ R ∝ 1/A

H ∝ I/πr²

Therefore, heat increases with decrease in thickness and vice versa.