The displacement current of 4.425 μ A is developed in the space between the plates of parallel plate capacitor when voltage is changing at a rate of 106 Vs-1. The area of each plate of the capacitor is 40 cm2. The distance between each plate of the capacitor is x × 10-3. The value of x is,

(Permittivity of free space, E 0 = 8 . 8 5 × 1 0 1 2 C 2 N 1 m 2 ) _ _ _ _ _ _ _ _ _ _  

0 3 Views | Posted 2 weeks ago
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    Answered by

    Vishal Baghel | Contributor-Level 10

    2 weeks ago

    According to definition of displacement current, we can write

    I d = ε 0 d ? d t = ε 0 d ( E S ) d t = ε 0 d ( V l S ) d t = ε 0 S l ( d V d t )

    l = 8 . 8 5 × 1 0 1 2 × 4 0 × 1 0 4 × 1 0 6 4 . 4 2 5 × 1 0 6 8 × 1 0 3 m

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V
Vishal Baghel

v = 1 ε μ = 1 2 ε 0 . 2 μ 0 = 1 2 ε 0 μ 0 = c 2 = 1 5 × 1 0 7 m / s .

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Vishal Baghel

B 0 2 2 μ 0 C

B 0 2 = I 2 μ 0 C

B 0 2 = 0 . 2 2 × 2 × 4 × 1 0 7 9 × 1 0 8

B0 = 42.9 × 10-9

42.9 Ans

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Vishal Baghel

s? = -? + k? ∴ s? = (-? +k? )/√2

V
Vishal Baghel

I = P/ (4πr²) . (i)
and I = (1/2)ε? E? ²c . (ii)
From (i) and (ii)
P/ (4πr²) = (1/2)ε? E? ²c
E? = √ (2P/ (4πε? r²c) ; E? = √ (9×10? ×2×15)/ (15×15×10? ×3×10? ) = 2×10? ³ V/m

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Vishal Baghel

d_lm = Distance covered by transmitting antenna + Distance covered by receiving antenna

⇒ d_lm = √ (2Rh_transmitting) + √ (2Rh_receiving)
⇒ d_lm = √ (2 × 64 × 10? × 20) + √ (2 × 64 × 10? × 5) = 16000 + 8000 = 24000m

When h_receiving = 0 then
d_2m = √ (2 × 64 × 10? × 20) = 16000m

% increment = (8000/16000) × 100 = 50

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