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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 connectedOR^{o}. Show this relationship graphically.what is displacement current????

what is conduction current???

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???

1) 5

2) 20

3) 10

4) zero

self induction is called the inertia of electricity.why?

^{2}. Its plane is kept perpendicular to a magneticfield of 0.3 Wb m

^{–2}and is rotated through 180°. Calculate the change in magnetic flux.show that lenz's law is in accordance with the law of conservation of energy???

Answer is (4) plz tell the reason

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.

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.$\left(1\right)\frac{B{v}_{0}L}{3r},\frac{2}{3},\frac{B{v}_{0}L}{3r},\frac{1}{3}\frac{B{v}_{0}L}{3r}\phantom{\rule{0ex}{0ex}}\left(2\right)\frac{B{v}_{0}L}{3r},\frac{1}{3},\frac{B{v}_{0}L}{3r},\frac{2}{3}\frac{B{v}_{0}L}{3r}\phantom{\rule{0ex}{0ex}}\left(3\right)\frac{B{v}_{0}L}{3r},\frac{1}{3},\frac{B{v}_{0}L}{3r},\frac{1}{3}\frac{B{v}_{0}L}{3r}\phantom{\rule{0ex}{0ex}}\left(4\right)\frac{B{v}_{0}L}{3r},\frac{B{v}_{0}L}{3r},\frac{B{v}_{0}L}{3r}$

i a circuit with a coil of resistance 2 ohms, the magnetic flux changes from 2 wb to 10 wb in 0.2 second. the charge that flows in the coil during this time is

5 coulomb

4 coulomb

1 coulomb

0.8 coulomb

please help me xperts

Why a transformer cannot step up dc voltage?

(Answer 2L)

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

A magnet is allowed to fall through a metallic ring.During fall what will

can any please xplain ac generator?

description about dead beat galvanometer

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 ?

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

12) The current through 2 inductors of self inductance 15 mH and 25 mH is increasing with time at the same rate. Draw graphs showing variation of

a) emf inductance with the rate the of change of current.

b) Energy stored in each inductor with the current flowing through it. Compare the energy stored in the calro, if the power disputed in the calro so the same.

1)E increases

2)I increases

3)Q remains same

4)Q increases

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 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.how to make project on mutual induction?

a, P b. Q c, L d. M

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.

the magnetic filed in the coil of 100 turns and 40 square cm area is increased frm 1 tesla to 6 tesla in 2 second. the magnetic field is perpendicular to the coil. the emf generated in it is

10 rase to 4 v

1.2 v

1.0v

10 rase to -2 v

please give me the full answer experts

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.

3. A conductor of length 0.5 m situated in and at right angles to a uniform magnetic field of 1 T moves with a velocity of 40 m/s. Calculate the emf induced in the conductor. What will be the emf induced if the conductor moves at an angle of 60° to the field?

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...

Q. Two magnets have the same length and the same pole strength. but one of the magnet has a small hole at its centre .Then.

Answer options:

$\bullet \mathrm{Both}\mathrm{have}\mathrm{equal}\mathrm{magnetic}\mathrm{moment}.\phantom{\rule{0ex}{0ex}}\bullet \mathrm{One}\mathrm{with}\mathrm{hole}\mathrm{has}\mathrm{smaller}\mathrm{magnetic}\mathrm{movement}.\phantom{\rule{0ex}{0ex}}\bullet \mathrm{One}\mathrm{with}\mathrm{hole}\mathrm{has}\mathrm{larger}\mathrm{magnetic}\mathrm{movement}.\phantom{\rule{0ex}{0ex}}\bullet \mathrm{One}\mathrm{with}\mathrm{the}\mathrm{hole}\mathrm{loses}\mathrm{magnetism}\mathrm{through}\mathrm{the}\mathrm{hole}.$

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?WHAT IS A CHOKE COIL?? ITS ADVANTAGES AND APPLICATION

^{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 ?A coil of wire having finite inductance and resistance has a conducting ring placed coaxially within it .The coil is connected to a battery at time t=0,so that a time-dependent current I_{1}(t) starts flowing through the coil.If I_{2}(t) is the current induced in the ring ,and B(t) is the magnetic field at the axis of coil due to I_{1}(t),then as a function of time(t0),the product I_{2}(t) and B(t)(A)increases with time (B)passes through a maximum [Choose the correct option and also give reason]Derivation for Energy Stored in an INDUCTOR

4. Two co-axial solenoids shown in figure. If key of primary suddenly opened then direction of instantaneous induced current in resistance 'R' which connected in secondary :

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

why do there is no deflection in galvanometer when the bar magnet is stationary in coil??

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.

Explain in detail !!

what is the dimention formula of induced emf

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

1.A conductor 30 cm long rotates about one end at 1000 rpm in a plane perpendicular to the magnetic field strength of 0.5 wb/m

^{2.}Find the emf induced in it.

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

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)

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.

Define fringe width, Derive an expression for fringe width in youngâ€™sdouble slitexperiment.V volt is induced in the loop. The work done (joules) in taking a charge Q coulomb once along the loop

factors on which mutual inductance of two coils depends

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

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?

why does deflection in the galvanometer increases dramatically when the iron rod is inserted along the axis of two coils?

- 5 MHz and
- 100 MHz transmitted from a ground transmitter at a height of 300 m located at a distance of 100 km. Identify whether it is coming via space wave or sky wave propagation or satellite transponder.

( Given the value of radius of the earth is 6400 km and maximum electron density, N_{max}=10^{12}m^{-3})OR^{-1}. For safety ,we would like the field never to exceed say 10% of the dielectric strength. What minimum area of the plates is required to have a capacitance of 50 pF ?OR^{-19}C,mp=1.67 x 10^{-27}kg ). Express your answer in units of MeV ( 1 MeV =1.602 x 10^{-13}J)ORSubmitted By : Mr. Ajay YadavEmail: ajay3016@yahoo.com

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.

Prove that E=1/2LI^2

1 Find the direction of induced current for the given cases:-

(Where w.r.t= with respect to time and ob=observer)

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) $\frac{1}{4}B\omega {R}^{2}$a coil having L = 2 mH current flowing through it is I = t

^{2 }e^{-t }then the time at which emf become 0The loop in question # 1 is rotated to that it is parallel to the magnetic field. If this takes 0.1 seconds, find the voltage induced in the loop.

The magnetic flux through a coil containing 50 loops changes from 30 Wb to ?30 Wb in 0.42 seconds. What is the voltage induced in the coil?

A square coil, 6.5 cm on a side, consists of 275 loops. If the magnetic field is perpendicular to the loop, find the voltage induced if the field changes from 2.0 T to 0.5 T in 0.05 seconds.

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 !

such that water coming out from them have same range. If the range of water coming out of the holes

is half of maximum range, then the distance x between these holes is

$\left(1\right)\frac{\sqrt{5}H}{4}\phantom{\rule{0ex}{0ex}}\left(2\right)\frac{\sqrt{3}H}{4}\phantom{\rule{0ex}{0ex}}\left(3\right)\frac{2H}{3}\phantom{\rule{0ex}{0ex}}\left(4\right)\frac{\sqrt{3}H}{2}$

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..

what is the basic cause of electromagnetic induction?

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

^{6}m/s, and_{92}U^{238}undergoing α- decay is 4.5×10^{9}years. What is the activity of 1g sample of_{92}U^{238}?When a resistance of 15Ω is connected in series with ‘Y’, the null point is found to shift by 10cm towards the end A of the wire. Find the position of null point if a resistance of 30Ω were connected in parallel with ‘Y’.

_{1}and E_{2}are connected together in two ways shown here.The 'balance points' in a given potentiometer experiment for these two combinations of cells are found to be at 351.0cm and 70.2cm respectively. Calculate the ratio of the emfs of the two cells.