Call me

Have a Query? We will call you right away.

+91

E.g: 9876543210, 01112345678

We will give you a call shortly, Thank You

Office hours: 9:00 am to 9:00 pm IST (7 days a week)

What are you looking for?

Syllabus

Long Type Questions(3 marks)

_{2}and hence derive expression for the energy density of the capacitor._{1}and n_{2}(n_{2}> n_{1}) respectively. Using this diagram, derive the relation.What happens to the focal length of convex lens when it is immersed in water?_{1}, C_{2}and C_{3}are connectedORwhat is displacement current????

what is conduction current???

(Answer 2L)

i need numericals solutions of nootan for physics plz help me to find this?

derive the dimensional formula of magnetic flux with each steps clearly???

self induction is called the inertia of electricity.why?

Ris rotated with an angular velocity ω perpendicular to the plane of a magnetic fieldBas shown in the figure. Emf induced in the loop is(1)

BωR^{2}(2) $\frac{1}{2}B\omega {R}^{2}$ (3) $\frac{3}{2}B\omega {R}^{2}$ (4) $\frac{1}{4}B\omega {R}^{2}$show that lenz's law is in accordance with the law of conservation of energy???

A coil of mean area 500 cm^2 of having 1000 turns is held perpendicular to a uniform field of 0.4 Gauss.The coil is turned through 180 degree in 1/10th of a second.Calculate the average induced E.M.F.

Why a transformer cannot step up dc voltage?

44. A uniform rod of mass m is moving with constant velocity v

_{0}in a perpendicular uniform magnetic field B as shown. The resistance of rod is r. The current flowing through rod, R_{1}and R_{2}are respectively.$\left(1\right)\frac{B{v}_{0}L}{3r},\frac{2}{3},\frac{B{v}_{0}L}{3r},\frac{1}{3}\frac{B{v}_{0}L}{3r}\phantom{\rule{0ex}{0ex}}\left(2\right)\frac{B{v}_{0}L}{3r},\frac{1}{3},\frac{B{v}_{0}L}{3r},\frac{2}{3}\frac{B{v}_{0}L}{3r}\phantom{\rule{0ex}{0ex}}\left(3\right)\frac{B{v}_{0}L}{3r},\frac{1}{3},\frac{B{v}_{0}L}{3r},\frac{1}{3}\frac{B{v}_{0}L}{3r}\phantom{\rule{0ex}{0ex}}\left(4\right)\frac{B{v}_{0}L}{3r},\frac{B{v}_{0}L}{3r},\frac{B{v}_{0}L}{3r}$

Prove that an ideal inductor does not dissipate power in an a.c circuit.

the equivalent inductance of two inductors is 2.4 H when connected in parallel and10 H when connected in series .The difference between two inductance is(neglecting mutual induction between coils)

Q two neighbouring coils A and B have a mutual inductance of 20mH . The current flowing through A is given by I=3t^2 -4t+6.the induced emf at t=2s is

can any please xplain ac generator?

(i) magnetic flux (?) through the loop with time (t).

(ii) induced emf (?) in the loop with time t.

(iii) induc ed current in the loop if it has resistance of 0.1 ?.

Answer is (4) plz tell the reason

description about dead beat galvanometer

An electric motor operates on 50V supply and carry currrent 12A. If the efficiency of the motor is 30% what is the resistance of the winding of the motor.

HOW DOES THE MUTUAL INDUCTANCE OF A PAIR OF COIL CHANGE WHEN

1 THE DISTANCE B/W 2 COIL IS INCREASED

2 NUMBER OF TURNS IN EACH OF 2 COIL IS DECREASED

A bar magnet M falling under gravity through an air cored coil C . plot a graph show variation of induced emf (E) with time(t). what does the area enclosed by the E-T curve depict ?

The arm PQ of the rectangular conductor is moved from x=0, outwards. The uniform magnetic field is perpendicular to plane and exerts from x=0 to x=b and is 0 for x > b. Only the arm PQ possess substantial resistance r. Consider the situation when the arm PQ is pulled outward from x = 0 to x= 2b, and is then moved back to x=0 with constant speed v. Obtain expression for the flux, induced emf, the force necessary to pull the arm and the power dissipated as joule heat. Sketch the variation of these quantities with distance.

PhysicsNumerical Questions(2 marks)

^{19}Hz in free space.1.5×10is placed at the centre, find the force experienced by the test charge.^{-9}C2 identical loops are of copper and d other of aluminium r rotated wid same angular speed in d same magnetic field compare

i) induced EMF ii)current produced in 2 coils

justify ur answer

(a) emf induced with the rate change of current in each inductor

(b) energy stored in each inductor with the current flowing through it.

Compare the energy stored in the coils , if the power dissipated in the coils is the same .

how to make project on mutual induction?

6. A conducting rod PQ of length 'l' connected to a resistor R, is moved at a uniform speed v, normal to a uniform magnetic field B as shown in the figure. (i) Deduce the expression for the emf induced in the conductor.

(ii) Find the force required to move the rod in the magnetic field.

(iii) Mark the direction of induced current in the conductor.

A metallic rod of length l is rotating with an angular frequency w(omega) with one end hinged at the centre and other end at the circumference of a circular metallic ring of radius l about an axis passing through the centre & perpendicular to the plane of rotation. A uniform magnetic field of B tesla is perpendicular to the plane of rotation every where. Find the emf between the centres and the metallic ring.Two identical loops, one of copper and other of aluminium are rotated with the same angular speed in the magnetic field.Compare 1) induced emf 2) the current prodeuced in two coils. Justify your answer.

falling under gravity in a region having a magnetic field. If z is the

vertical direction, the z-component of magnetic field is B

_{z}= B_{o}(1+λ z). If R is the resistance of the ring and if the ring falls with a

velocity v, find the energy lost in the resistance. If the ring has

reached a constant velocity, use the conservation of energy to

determine v in terms of m, B, λ and acceleration due to gravity g.

A conducting rod of length L with one end pivoted is rotated with uniform angular speed W in a vertical plane normal to the magnetic field B.Deduce an expression for emf induced in this rod.?plz answer this question as soon as possible and if possible plz answer the question today only..plz plz plz...

A simple pendulum with bob of mass m and conducting wire of length L swings(is hanging ) under gravity thro' an angle 2theetha.

The earth's magnetic feild component in the direction perpendicular to swing is B.

the max potential diff induced across pendulum is?

WHAT IS A CHOKE COIL?? ITS ADVANTAGES AND APPLICATION

1)E increases

2)I increases

3)Q remains same

4)Q increases

A long solenoid with 15 turns per cm has a small loop of area 2.0 cm

^{2 }placed inside the solenoid normal to its axis. If the current carried by the solenoid changes steadily from 2.0 A to 4.0 A in 0.1 s, what is the induced emf in the loop while the current is changing?^{2}completely surrounds another coaxial solenoid of the same length , area of cross section 25 cm^{2}with 25 turns per cm . calculate the mutual inductance of the system ?The no. of turns in coil of an ac generator is 5000 and the are of coil is 0.25m

^{2 }The coil is rotated at the rate of 100cycle/sec in a magnetic field of 0.2weber /m^{2 . }the pack value of emf generated is nearly?Derivation for Energy Stored in an INDUCTOR

what is the dimention formula of induced emf

What is motional E.M.F? Derive expression for it.

Could you please derive the mutual induction and self induction for a conductor?

Cand_{1}Care placed close to each other.find out the expression for the_{2}induced emfin the coil C_{1}due to a change in the currrent through the coil C_{2}?Electromagnets are made of soft iron because soft iron has:

low retentivity and high coercive force

high retentivity and high coercive force

low retentivity and low coercive force

high retentivity and low coercive force

Kindly explain the answer also.

33. The current carrying wire and the rod AB are in the same plane. The rod moves parallel to the wire with a velocity v. Which one of the following statements is true about induced emf in the rod ?

(b) A and B will be at the same potential

(c) There will be no induced emf in the rod

(d) Potential at A will be higher than that at B.

A solenoid have the self inductance 2H.If length of the solenoid is doubled having turn density and area constant then new self inductance is:-

(1)4 H

(2) 1 H

(3) 8 H

(4) 0.5 H

Define fringe width, Derive an expression for fringe width in youngâ€™sdouble slitexperiment.factors on which mutual inductance of two coils depends

A metallic rod of length l is rotated at a constant angular speed omega, normal to a uniform magnetic field B. Derive an expression for the current induced in the rod, if the resistance of the rod is R.

1.A coil is mechanically rotated with constant angular speed (w) in a uniform magnetic field which is parallel to the axis of rotation of the coil, the plane of the coil initially held perpendicular to the field. Plot a trap showing variation of 1. Magnetic flux 2. The induced emf in the coil as a function of (wt).

why is spark produced in the switch of a fan ,when it is switched off?

Prove that E=1/2LI^2

Explain briefly how the phenomenon of resonance in the circuit can be used in the

tuning mechanism of a radio or a TV set.Q. A conducting rod held horizontally along East-West direction is dropped from rest from a certain height near the Earth's surface. Why should there be an induced emf across the code of the rod? Draw a plot showing the instantaneous variation of emf as a function of time from the instant it begins to fall.

a coil having L = 2 mH current flowing through it is I = t

^{2 }e^{-t }then the time at which emf become 0(b) In an orbit of radius R, an electron is moving round a proton with uniform circular velocity .Derive the gyromagnetic ratio of the electron of charge(-e) and mass(m

_{e}).What is Bohr magneton?a)current will decrease

2)current will increase

3)current will remain the same..

i didn't understand how to apply lenz law in this prblm..

plz...i can't undrstd working of a.c generator??

Is the algebraic sum of these voltages more than the source voltage? If yes, resolve the paradox.

^{-2}m towards the slits, the change in fringe width is 3x 10^{-5}m. If the distance between slits is 10^{-3}m, calculate the wavelength of light used.^{-2}Wb/m^{2}and angle of dip is 300. Calculate the value of^{-2}/k.Q.7. (a) Give the direction of induced current in S when the resistance R is being increased.

A horizontal straight wire 10m long extending from east to west is falling with a speed of 5m pert sec.at right angles to the horizontal componen of the earths magnetic field 0.3 X 10 n^ -4

I know the answer to emf induced

Please in detail xplain me how to use flemings right hand rule here Becoz only direction of force is known i.e downward .. which is at high potential and why !!M not clear !

_{1}and C_{2}as shown in the figure.^{2}and 2 cm^{2}. The rate of flow is 500 cm /sec. Find difference in mercury level of U-tube :-anw 1.90 cm how it work out