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factors on which resistance depend are:-1. resistivity of the conductor2. length of the conductor3. cross sectional area of the conductor

if the lamp and conductor connected in series then total resistance=20+4= 24 ohm

if the lamp and conductor comnected jn parallel then total resistance =(1/20)+(1/4) = 0.05+0.25 = 0.3ohm

Thank you

total resistance is equal to 8 ohm

Fleming's Right-hand Rule (for generators) shows the direction of induced current when a conductor attached to a circuit moves in a magnetic field. It can be used to determine the direction of current in a generator's windings.

When a conductor such as a wire attached to a circuit moves through a magnetic field, an electric current is induced in the wire due to Faraday's law of induction. The current in the wire can have two possible directions. Fleming's right-hand rule gives which direction the current flows.

The right hand is held with the thumb, index finger and middle finger mutually perpendicular to each other (at right angles), as shown in the diagram.[1]

The thumb is pointed in the direction of the motion of the conductor relative to the magnetic field.The first finger is pointed in the direction of the magnetic field. (north to south)Then the second finger represents the direction of the induced or generated current within the conductor (from the terminal with lower electric potential to the terminal with higher electric potential, as in a voltage source)The bolded letters in the directions above give a mnemonic way to remember the order. Another mnemonic for remembering the rule is the initialism "FBI", standing for Force (or otherwise motion), B the symbol for the magnetic field, and I the symbol for current. The subsequent letters correspond to subsequent fingers, counting from the top. Thumb -> F; First finger -> B; Second finger -> I

There is also a Fleming's left hand rule (for electric motors). The appropriately handed rule can be recalled from the letter "g", which is in "right" and "generator".

These mnemonics are named after British engineer John Ambrose Fleming, who invented them.

Agalvanometeris an electromechanical instrument for detecting and measuring electric current. The most commonuse of galvanometerswas as analog measuring instruments, called ammeters,usedto measure the direct current (flow of electric charge) through an electric circuit.

चुम्बकीय सुई या चुम्बकीय कम्पास (Magnetic Needle) में एक छोटे सुई के आकार के चुम्बक को एक काँच के ढक्कन वालेअचुम्बकीय पदार्थ से बने खोल में एक चूल (pivot) पर आलम्बित किया जाता है | सुई के उत्तरी-धूर्व अंश को काले रंग दिया जाताहै | जिससे की दोनों धुरवों में से उत्तरी-धूर्व को स्पष्ट रूप से पहचाना जा सके | चुम्बको के उपरोक्त वर्णित गुणों केअनुसार,चुम्बकीय सुई सदैव उत्तर-दक्षिण दिशा में ठहरती है| इस लघु यंत्र का उपयोग, प्रयोगशालाओ में किया जाता है | नाविक,इस यंत्र की सहायता से अपने जलयान के शीर्ष की दिशा को वास्तविक उत्तर दिशा (True north) की अपेक्षा वांच्छिक दिशा में सैटकरने के लिए प्रयोग करते है |

किसी चुम्बक के चारो ओर का वह क्षेत्र जिसमे किसी बिन्दु पर रखी गई चुम्बकीय सुई (Magnetic Needle) एक निश्चित दिशा मेंठहर जाती है चुम्बकीय क्षेत्र कहलाता है |चुम्बकीय क्षेत्र को काल्पनिक बल रेखाओ (Magnetic Lines of force ) का बना माना जाता है | चुम्बकीय बल रेखा एकनिषकोण वक्र है जिसके किसी बिन्दु पर खीची गई स्पर्श रेखा उस बिन्दु पर कार्यरत चुम्बकीय क्षेत्र की दिशा को प्रदर्शित करती है |

c) is correct answer

Definition of permittivity. : the ability of a material to store electrical potential energy under the influence of an electric field measured by the ratio of the capacitance of a capacitor with the material as dielectric to its capacitance with vacuum as dielectric. — called also dielectric constant.

In SI units, permittivity is measured in farads per meter (F/m or A.

Dimesnion of velocity is metres per second (m/s).

A dimension is a measurement such as length, width, or height

For the body ‘A’, the distance travelled in 5thsecond is,

S5= 0 + ½ a1(2n - 1)

=> S5= 9/2 a1 [n = 5]

For the body ‘B’, the distance travelled in the 5thsecond after the start of A is actually the distance travelled by the body B in the 3rdsecond, since, B starts 2 s later.

Therefore,

S3= 0 + ½ a2(2n - 1)

=> S3= 5/2 a2 [n = 3]

Since, the distance travelled are same,

9/2 a1= 5/2 a2

=> a1: a2= 5 : 9

Force exerted is equal to the change in momentum in one second. Now, retardation is rate of decrease of velocity. The value of retardation is given as 2g. Then,

Force, F=dp/dt=m(dv/dt). But,

m=W/g and dv/dt=2g, therefore ,

F=(W/g)(2g)=2W

ladder is 1 .5 m

= Radius of circular path = 150 m= Perimeter or length of path = 2 Pi r = 2 * 22 / 7 * 150 = 942.85 m.

= v = u + a t

= 30 = 0 + 8 * t

= t = 3.75 s.

S = u t + 1 /2 a t^2

942.85 = 0 + 1 / 2 * a * 3.75^2

= 942.85 = 7.03 a

= a = 13.4 m/s.

Why did you take initial velocity 0? It is not stated and we can't assume that...

Correct option is C) 90

Mechanic / Hydraulic horsepower

1 hp(I) = 745.699872 W=0.745699872 kW

Electrical horsepower

1 hp(E) = 746 W = 0.746 kW

Proof:

One mechanical horsepower of 550 foot-pounds per second is equivalent to 745.7 watts.

1 hp = 550 Foot Pound per second

1 Pound = 4.44822 Newtons

1 Foot is 0.3048 Meters.

1 hp = 550 * 4.44822 * 0.3048 meters

1 hp = 745.69 Newton meter per second = 746watts

This arrangement is a wheat stone bridge

as 4/6 = 2/3 ..

so. here , the middle resistance has no. current.

so, the 4Ω and 2Ω , will combine in series add up to 6Ω

and the lower 6 and 3 will add up to 9Ω

now this 6 and 9 are in parallel to each other so, Req = 6*9/(9+6) = 54/15 Ω

so I = V/R = 15V/54 = 5V/18 .

As 4/6= 2/3so middle resistance will be removedBecause of balance bridgeso now4+2//6+3= 6//9= 6*9/15= 54/15 total resistancenow I= V/R= V/54/15= 15V/54= 5V/18

f=c/lf=3*10^8/1f=3*10^8sec^-1

Α.B = (-2î+3ĵ-4k̂).(3̂î-4ĵ+5k̂)= (-2*3) + (3*-4) + (-4*5)=-6-12-20=-38

the unit of the heat is joule

joule is the unit of heat

Answer:The bird will suffer more change in momentum.

Explanation:Becoz. as compared to car the mass of a bird is negligible and also the velocity of car is more than that of bird...after the collision the car continues to be in motion whereas the bird comes to hault(rest)..therefore there is more change in momentum of the bird..

Definition of Resonance - "The increase in amplitude of oscillation of an electric or mechanical system exposed to a periodic force whose frequency is equal or very close to the natural undamped frequency of the system."

wrong answers

We knowthatV= u+ata= v-u/tV= 10*1000/3600= 100/36= 50/18u= 40*1000/3600= 400/36= 100/9= 50/18-100/9/(5)2.7-11.1/51.682 retarded motionas a= -ve

is it one question answer or full book answer

The dimensions of Planck's constant are the same as those of angular momentum.

hence, ML^2T-1 is correct for both.

A unit vector is any vector that has a magnitude of one and could be pointing in any direction.

unit vector=given vector/magnitude of that vectorgiven vector=3i+7j+4kmagnitude=(3^2 +7^2 +4^2)^0.5magnitude=(9+49+16)^0.5=74^0.5unut vector=(3i+7j+4k)/(74^0.5)

During first 4 sS = ut + 0.5at²48 m = (0 m/s × 4 s) + (0.5 × a × (4 s)²)48 m = (a × 8s²)a = 6 m/s²

Velocity at the end of 4s isv = u + at= 0 m/s + (6 m/s² × 4 s)= 24 m/s

Now, for rest of the journeya’ = (v² - u²) / (2S)= (0² - 24²) / (2 × 24)= -12 m/s²

∴ Deceleration of bus is 12 m/s²

thank you very much

Initial velocity u=5m/s, final velocity v=0retardation=am/s2,. time=0.5secv=u+at0=5+a×0.5a=-10m/s2mg can be resolved as mgcos30° (acting opposite to normal reaction)and mgsin30°.(acting downwards)(R ) normal reaction=mgcos30°friction f=uR, where u is cofficient of frictionnet force= -(f+ mgsin30°)ma=-(uR+mgsin30)m(-10)=-(u.mgcos30+mgsin30)10m=m(u×√3/2+1/2).g10/g=√3u/2+1/2take g=10, and solving the equationu=1/√3

During first 4 sS = ut + 0.5at²48 m = (0 m/s × 4 s) + (0.5 × a × (4 s)²)48 m = (a × 8s²)a = 6 m/s²

Velocity at the end of 4s isv = u + at= 0 m/s + (6 m/s² × 4 s)= 24 m/s

Now, for rest of the journeya’ = (v² - u²) / (2S)= (0² - 24²) / (2 × 24)= -12 m/s²

∴ Deceleration of bus is 12 m/s²