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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???

A copper ring is suspended by a thread in a vertical plane. One end of the magnet is brought horizontally towards the ring. How will be the position of the ring affected?

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.

the axle is maximum when it moves

(1) At the poles

(2) At equator

(3) Remains stationary

(4) No e.m.f. is induced at all

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?

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.

^{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.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

(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 .

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

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

how to make project on mutual induction?

^{o}about it's one of the diameters in 2 seconds. Find the rate of change of magnetic flux through the coil.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.

a 28 turn coil with average diameter of 0.02 m is placed perpendicular to a magnetic field of 8000 T. if the field changes to 3000 T in 4 s, what is the magnitude of the induced emf

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...

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 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?(a).induction furnance

(b).magnetic furnance

(c).speedo.eter

(d).A.C generator

WHAT IS A CHOKE COIL?? ITS ADVANTAGES AND APPLICATION

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

^{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) charge on both the capacitors is same

(B) induced emf in the inductor is zero

(C) potential difference across both the capacitors is same

(D) electrostatic potential energy stored in both the capacitors is same

Derivation for Energy Stored in an INDUCTOR

(b)l' is movable. The loop is kept in a uniform magnetic field 'B' directed downward perpendicular to the plane of the loop. The arm RS is moved with a uniform speed v.Deduce an expression for

(i) The emf induced across the arm 'RS'

(ii) The external force required to move the arm, and

(iii) The power required to push RS.

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

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).

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

answer fast please

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

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)

Define fringe width, Derive an expression for fringe width in youngâ€™sdouble slitexperiment.why does deflection in the galvanometer increases dramatically when the iron rod is inserted along the axis of two coils?

factors on which mutual inductance of two coils depends

Explain in detail !!

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?

an iron bar falling through the hollow region of a thick cylindrical shell made of copper experiences a retarding force. what can you conclude about the nature of the iron bar

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.

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.

(a) 0.43

(b) 0.57

(c) 1.7

(d) 0.34

Prove that E=1/2LI^2

Q.28. (iii) Derive the expression for maximum value of the induced emf and state the induced emf and state the rule that gives the direction of the induced emf.

(iv) Show the variation of the emf generated versus time as the armature is rotated with respect to the direction of the magnetic fields.

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 !

13. a. Derive an expression for maximum induced emf produced by an AC generator.

b. Draw a graph to show the variation of induced emf with time for one complete cycle of the armature coil. c. Draw graphical variation of magnetic flux linked with the armature coil with time for one complete cycle of the armature coil.

ORb. A bulb is connected to series combination of inductor and capacitor along with an AC source. Explain the change in brightness of the bulb as frequency of the source is increased from zero to infinity.

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)

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