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Yogita Ingle 6 years, 1 month ago
Radioactivity
- Radioactivity is a nuclear phenomenon in which an unstable nucleus undergoes decay to form stable nuclei.
- Radioactivity was discovered accidentally by a scientist Henry Becquerel (1896).
- Only those nuclei which are unstable will show the phenomenon of radioactivity.
- Fluorescence is a property shown by fluorescent objects; when visible light falls on a fluorescent object then these objects will also start emitting light.
- Henry Becquerel performed experiments on some fluorescent objectsand he gave a hypothesis that fluorescent objects along with the visible light also emit some kind of radiation as well.
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Yogita Ingle 6 years, 1 month ago
Resistance of the resistor, R = 100 Ω
Supply voltage, V = 220 V
Frequency, ν = 50 Hz
The rms value of current in the circuit is given as
I= (V/R)
= (220)/ (100)
= 2.20 A
The net power consumed over a full cycle is given as:
P = VI
= 220 × 2.2 = 484 W
Posted by Nitin Kumar 6 years, 1 month ago
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Yogita Ingle 6 years, 1 month ago
It is one of the fundamental quantities in Physics and the most basic property of matter. We can define mass as the measure of the amount of matter in a body. The SI unit of mass is Kilogram (kg).
Posted by Ganeshi Verma 6 years, 1 month ago
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Yogita Ingle 6 years, 1 month ago
Current:- Current strength, in a conductor, is defined as the rate of flow of charge across any cross section of the conductor.
I= q/t = ne/t
For non-uniform flow,
I= dq/dt
Or, q = I dt
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Yogita Ingle 6 years, 1 month ago
Let any arbitrary closed path perpendicular to the plane of paper around a long straight wire XY , it is carrying current from X to Y lying in the plane of paper.
Let the closed path is formed by large number of small elements
e.g., AB = dL₁, BC = dL₂, CD = dL₃ .......angles subtended by all elementary lengths are dθ₁ , dθ₂ , dθ₃.....also you can see that,
dθ₁ + dθ₂ + dθ₃ + ......... = 2π ---------------------------(1)
you know one important things,
θ = l/r , here θ is angle , r is the radius and l is the length
⇒ dL₁/r₁ + dL₂/r₂ + dL₃/r₃ + ............ = 2π
now, B₁, B₂ , B₃....... are magnetic field induced at a point along the elements dL₁ , dL₂ , dL₃ ......... now, use Biot - savart law,
we know, according to this law, magnetic field for infinite length conductor is B = μ₀i/2πr, where r is the seperation between conductor and point of observation.
now, here, B₁ = μ₀i/2πr₁ , B₂ = μ₀i/2πr₂ , B₃ = μ₀i/2πr₃ ......... now, line integral of B around closed path is ,
∮B.dL = B₁.dL₁ + B₂.dL₂ + B.dL₃ +..........
= μ₀i/2πr₁.dL₁ + μ₀i/2πr₂.dL₂ + μ₀i/2πr₃.dL₃ +.....
= μ₀i/2π [dL₁/r₁ + dL₂/r₂ + dL₃/r₃ +.......]
= μ₀i/2π [ dθ₁ + dθ₂ + dθ₃ + .........]
now, from equation (1)
∮B.dL = μ₀i/2π × 2π = μ₀ie.g., ∮B.dL = μ₀i ,this is the expression of Ampere circuital law,
hence, biot-savart law enables one to express the Ampere's circuital law in the integral form
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Riya Singh 6 years, 1 month ago
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