A copper wire has a diameter of 2mm. The wire carries a constant current 3A. Assuming the density of electrons to be 8.5*10^28 m^-3. Find the magnitude of a.current density and b.drift velocity?

Anonymous User Physics Current Electricity 23 Feb, 2020 2 Answer 76 views

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john jorge Computer 11 Feb, 2020 0 Answer 75 views

yellow dust appears on the fingers, whenever we touch the middle of a flower. These tiny yellow grains are one of the most precious substances in nature because they contain the secret of plant life.  What is this dust called?

Anonymous User Biology 09 Feb, 2020 1 Answer 77 views

A ring is rotated about diametric axis in a uniform magnetic field perpendicular to the plane of the ring. If initially the plane of the ring is perpendicular to the magnetic field. Find the instant of time at which EMF will be maximum & minimum respectively?

Anonymous User Physics Electromagnetic Induction & Alternating Current 06 Feb, 2020 1 Answer 129 views

Two sources of sound moving with same speed v and emitting frequency of 1400 Hz are moving such that one source s1 is moving towards the observer and s2 is moving away from observer. If observer hears beat frequency of 2 Hz. Then find the speed of source. Given

Anonymous User Physics 03 Feb, 2020 1 Answer 227 views

The surface mass density of a disc of radius a varies with radial distance as

where A & B are positive constants then moment of inertia of the disc about an axis passing through its centre and perpendicular to the plane

Anonymous User Physics 03 Feb, 2020 1 Answer 95 views

A is one of 6 horses entered for a race and is to be ridden by one of two jokceys B and C.It is 2 to 1 that B rides A, in which case all the horses are equally likely to win .If C rides A, his chances of winning is trippled . what are the odds against winning of A?

Anonymous User Maths 02 Feb, 2020 1 Answer 97 views

A lift of mass 920 kg has a capacity of 10 persons. If average mass of person is 68 kg. Friction force between lift and lift shaft is 6000 N. The minimum power of motor required to move the lift upward with constant velocity 3 m/s is

Anonymous User Physics 24 Jan, 2020 1 Answer 227 views

A battery of unknown emf connected to a potentiometer has balancing length 560 cm. If a resistor of resistance

is connected in parallel with the cell the balancing length change by 60 cm. If the

internal resistance of the cell is 

, the value of 'n' is

Anonymous User Physics 24 Jan, 2020 1 Answer 131 views