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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???

(Answer 2L)

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

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) $\frac{1}{4}B\omega {R}^{2}$derive the dimensional formula of magnetic flux with each steps clearly???

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?

self induction is called the inertia of electricity.why?

Answer is (4) plz tell the reason

show that lenz's law is in accordance with the law of conservation of energy???

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)

Why a transformer cannot step up dc voltage?

can any please xplain ac generator?

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

Q.69. In the circuit shown what is the energy stored in the coil at steady state?

(a) 21.3 J

(b) 42.6 J

(c) Zero

(d) 213 J

description about dead beat galvanometer

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

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

^{2 }e^{-t }then the time at which emf become 0Q13. The magnetic flux in a coil of 100 turns increases by 12 × 10

^{3}maxwell in 0.2 s due to the motion of a magnet. The emf induced in the coil will be :-(1) 0.6 mV (2) 0.6 V (3) 6 V (4) 60 V

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.the armature of a generator of resistance 1 ohm is rotated at its rated speed produces 125V without load 115 V with full load . the current in the armature coil is

how to make project on mutual induction?

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 circular ring of diameter 20 cm has a resistance 0.01 ohm. The ring is turned from a position perpendicular to a magnetic field of 2 T to a position parallel to the field. The amount of charge flowing through the ring in the process is?

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.

(1) 3.125 × 10

^{–3}J (2) 6.25 × 10^{–4}J (3) 1.25 × 10^{–2}J (4) 5.0 × 10^{–4}JTwo 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.

27 A coil of resistance 20 ohms and inductance 5 H has been connected to a 100 volt battery. The energy stored in the coil is

(1) 31.25 J

(2) 62.5 J

(3) 125 J

(4) 250J

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...

(1) 15 mV (2) 4 mV (3) 64 mV (4) Zero

WHAT IS A CHOKE COIL?? ITS ADVANTAGES AND APPLICATION

A square loop of side 10cm and resistance 0.5 ohm is placed vertically in the east-west plane .Auniform magnet field of 0.10 T is set up across the plane in the north - east direction . The magnitudes field is decreased to zero in 0.07s at a steady rate . determine the magnitude of induced emf and current during this time-interval .

Derivation for Energy Stored in an INDUCTOR

(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 ?.

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?$1.\left({m}_{1}+{m}_{2}+{m}_{3}\right)\frac{{m}_{2}g}{{m}_{1}}\phantom{\rule{0ex}{0ex}}2.\left({m}_{1}+{m}_{2}\right)\frac{{m}_{2}g}{{m}_{1}}\phantom{\rule{0ex}{0ex}}3.\left({m}_{2}+{m}_{3}\right)\frac{{m}_{1}g}{{m}_{2}}\phantom{\rule{0ex}{0ex}}4.\left({m}_{1}+{m}_{3}\right)\frac{{m}_{1}g}{{m}_{2}}$

what is the dimention formula of induced emf

A) 2 A and 50 A

B) 50 A and 2 A

C) 25 A and 4 A

D) 12.5 A and 8 A

Would appreciate it if you could give a detailed explanation and solution.

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

A coil of inductance 2H and resistance 10 ohm is connected across a battery of 100 V alond with a key . At time t=0 the key is closed find the current in the circuit at t=1sec? Kindly answer sir/mam.

factors on which mutual inductance of two coils depends

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

Radius of a circular loop placed in a perpendicular uniform magnetic field is increasing at a constant rate of r

_{o }m/s. If at any instant, radius of the loop is r, then emf induced in the loop at that instant will be??Define fringe width, Derive an expression for fringe width in youngâ€™sdouble slitexperiment.A flat coil of 500 turns, each of area 50 cm

^{2}, rotates about a diameter in a uniform magnetic field of flux density 0-14 Wbm'^{2}, the axis of rotation being perpendicular to the field and the angular velocity of rotation being 150 rad/s. The coil has a resistance of 5 H and the induced e.m.f. is connected via slip rings and brushes to an external resistance of 10 ii. Calculate the peak" current flowing.thank you

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.

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.

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

^{o}about it's one of the diameters in 2 seconds. Find the rate of change of magnetic flux through the coil.plz...i can't undrstd working of a.c generator??

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..

Prove that E=1/2LI^2

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.r. If the current in the conductor AB varies at the rate ofxA/sec, then the induced emf in the coil C is(1) $\frac{{\mu}_{0}rx}{2}$ (2) $\frac{1}{4}\pi xr$ (3) $\frac{{\displaystyle {\mu}_{0}\pi xr}}{{\displaystyle 2}}$ (4) Zero

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 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 !

Q. Primary winding and secondary winding of a transformer has 100 and 300 turns respectively. If its input power is 60 W then output power of the transformer will be :-

(1) 240 W

(2) 180 W

(3) 60 W

(4) 20 W

- 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

The motion of a copper plate is damped when it is allowed to oscillatebetween the magnetic pole-pieces. How is the damping force, produced bythe eddy currents?

^{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 ?^{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 outIf number of turns of a solenoid is doubled while keeping all other factors constant, what would be the change in its self-inductance?

Two resistors of 10 ohm and 20 ohm and an ideal inductor of 10H are connected to a 2v battery. The key is shorted at time t=0. Find the initial and final currents through the battery.