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Ohm'slawstates that the current through aconductorbetween two points is directly proportional to the voltage across the two points. Thislawis one of the most basiclawsof electricity. It helps to calculate power, efficiency, current, voltage, and resistance of an element of an electricalcircuit.

Resistance is given by:

R=ρL/A

ρ=resistivity

L=length of the conductor(in m)

A=area of cross section of the conductor (in m2)

diameter is 0.4mm=0.4×10^-3m

Area =πd^2/4=1.25×10^-7m2

ρ=RA/L=2.5×1.25×10^-7/1.2=2.6×10^-7ohm m

Vᵣ = velocity of river or stream = ?

Vs = velocity of swimmer = 0.5 m/s

V= resultant velocity

given angle is total angle ie 90+30= 120

From figure in triangle Δ

sin θ = p/ h

sin 30⁰ = Vᵣ / Vs

1/2 = Vr/ 0.5

so Vr= 1/4 ie

Vr = 0.25 m/s so velocity of river is 0.25 m/ s

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Current= charge/timeso, I=Q/there number of electrons is 10and time, t= 10so charge, Q= 10* 1.6*10^-19 C

therefore, I=10* 1.6*10^-19 C/10I = 1.6*10^-19 A. (answer)

.Artificial food colurs makes the food colourful and more desirable. .They are responsible for the bright colors of candy, sports drinks and baked goods..beta carotene and beet extract natural food colurants.erythrosine, allura red, tartrazine are chemical food colurant.Harmful effects.linked with cancer.allergies.hyperactivity.irritability.hearing impairment.aggressiveness

A1V1=A2V2flowof a fluid in which its velocity at any point is constant or varies in a regular manner. It can be represented bystreamlines

Because the radiation coming from the nuclear substance consists of alpha rays beta rays and gamma rays alpha rays are positively charged therefore they deflect towards the negatively charged Cathode..Beta rays are negatively charged and therefore moves towards the positively charged anode.And Gamma rays are electrically neutral therefore they are not deflected by the electric field..Therefore a single ray coming from the nuclear substance gets divided into three rays and strike the photographic plate at three places..

Initial concentration of X is 1.Final concentration of X is 1/(1+15) = 1/16.Given: Half life of X is 50yrs.Therefore,

X -> X/2 ( 50 years ) ,X/2 -> X/4 ( + 50 yrs ),X/4 -> X/8 ( + 50 yrs ),X/8-> X/16 ( + 50 yrs )

Therefore, age of radioactive sample is

50+50+50+50 = 200 years

reading in the Voltmeter will give the potential difference across combination of R and A

so, V = 12v , and since current is 0.1A

so, 12 = 0.1(R+20)

=> 120 = R+20=> R = 120-20 = 100Ω

option 2

A metal rod or wire fixed to an exposed part of a building or other tall structure to divert lighting harmlessly into the ground.

all the resistance are in series in the both side of AD so 1+1+1= 3ohmand same for lower Branch = 1+1+1 = 3ohmnow two resistance of 9ohm are connected in parallelso result will be 3*3/3+39/63/2= 1.5 ohm

The circuit bis a high pass filter as the output voltage is taken across a resistor,Option b is correct.

thqso much

The circuit is a high pass filter as the output voltage is taken across a resistor,Option b is correct.

6A will be the value of currentincoming current = outgoing current at each node we did it with the help of Kirchoff current law

(i) elevation

Mountains have more steeper slope than Hills and mountains have higher elevations than Hills.

इसके बारे में सबसे महत्वपूर्ण हिस्सा न केवल यह है कि वस्तुएं एक-दूसरे पर खींचती हैं, बल्कि यह है कि दो वस्तुएं एक-दूसरे को एक बल के साथ आकर्षित करती हैं जो उनके द्रव्यमान के उत्पाद के आनुपातिक हैं और उनके बीच की दूरी के वर्ग के व्युत्क्रमानुपाती हैं। इसे न्यूटन के सार्वभौमिक गुरुत्वाकर्षण के नियम के रूप में जाना जाता है।

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Let P be the center of square ABCDThen diagonal of square of length sqrt(2) m = 2m

PA = PB = PC = PD = 1/2 diagonal = 1 m

Potential at P due to all the charges= 9 * 10^9 (10/1 + 5/1 - 3/1 + 8/1)= 9*10^9 (23 - 3)= 180 * 10^9

a) we know that C = AE°/d so, when distance d is doubled , the value of C' will be AE°/2d = C/2

b) where there is a di electric having K = 8, the value of C is kAE°/d = 8AE°/d = 8C.

Cosmic rays – radiation that reaches the Earth from space.Rocks and soil – some rocks are radioactive and give off radioactive radon gas.Living things – plants absorb radioactive materials from the soil and these pass up the food chain.

Explanation:One common source of background radiation is cosmic rays. This type of radiation comes from space and makes it through our atmosphere in small amounts. Certain rocks and parts of the Earth's surface give off background radiation, though the amount varies by location.

A microwave oven does emit thermal radiation to heat up food. Microwave radiation is thermal radiation. For some reason, pre-college teachers and books have a mistaken notion that thermal radiation = infrared radiation. All frequencies of the electromagnetic spectrum carry energy, from radio waves, microwaves, infrared waves, visible light, ultraviolet, and X-rays to gamma rays. All frequencies of radiation heat up an object that they strike and therefore can be thermal radiation. When physicists use the term "thermal radiation", they either mean radiation that has the ability to heat up an object it strikes. Or they mean a broad spectrum of frequencies with a certain shape that depends on the emitter's temperature.

how charge has come

no change because they have balamcing ratio (p/q=r/s) here p,q,r,s are the resistance value of wheatstone bridge

W = F × sandF = m × asoW = m × a × s"The body is accelerated from 0 to v in time t1"sov = 0 + a × t1a = v / t1The distance traveled in a certain time t is W = m × (v / t1) × ( (v × t²) / (2 × t1) )Rearranging the equation,W = (m × v² × t²) / (2 × t1²)Or, W = ( m × v² / 2 ) × ( t / t1 )²

whats your namw

Because voltage diffrence is there and current will keep flowingtill the violtage is not samw

Let the ratio factor be x.then A = 5x and B = 7xnow,5x = 185x = 185/5 = 37

B = 7x = 7*35 = 245B = 245

4) 0.2A, 0.4A is the correct answer

Ans :- Microwaves are a form of electromagnetic radiation with wavelengths ranging from about one meter to one millimeter; with frequencies between 300 MHz and 300 GHz. Different sources define different frequency ranges as microwaves; the above broad definition includes both UHF and EHF bands.

p1>p2

p=work/time

P1 is one minute work= 500/10=50j P2 is one minute work=600/20=30j P1>P2

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