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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 connectedORwhat 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???

self induction is called the inertia of electricity.why?

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?

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

can any please xplain ac generator?

description about dead beat galvanometer

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

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?

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 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 ?Derivation for Energy Stored in an INDUCTOR

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

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.

what is the dimention formula of induced emf

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

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

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)

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

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.

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

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

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?

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

^{2 }e^{-t }then the time at which emf become 0A 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 !

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..

(Answer 2L)

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) $\frac{1}{4}B\omega {R}^{2}$plz...i can't undrstd working of a.c generator??