Question

when key is switched on.which one of the following condition is possible​

Answer 1

Answer:

If the damping of the system becomes equal to zero, which condition of the resonant frequency is likely to ...

Answer 2

Answer:

The brightness of bulb "A" increases whereas bulb "B" decreases.

Explanation:

Let us assume the resistance of each bulb is "R"

Case 1: before the switch is closed.

Let I₁ be the current flowing, and the equivalent resistance in the circuit is R₁ = 2R

Therefore, the current flowing through the bulbs "A" and "B" will be:

$I_1 = \frac{V}{2R}$

Case 2: After the switch is closed.

Let $I_A$ be the current flowing through bulb "A" and $I_B$ be the current flowing through bulb "B", and the equivalent resistance in the circuit is

R₂ = 1.5 R

Therefore, the current flowing through the bulb "A" will be:

$I_A = \frac{V}{1.5R}$

And the current flowing through the bulb "B" will be :

$I_B = I_A/2 = \frac{V}{3R}$

Hence, through the bulb "A" the current has increased from V/2R to V/1.5R.

And through bulb "B" the current has decreased from V/2R to V/3R.

And as brightness depends on current.

i.e. the brightness of bulb "A" increases whereas bulb "B" decreases.

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