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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?

Explain in detail !!

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

A container contains 1 kg of water at 25°C. Then, 100 g of ice at − 10°C are added to it. (Specific heat of ice = 0.5 Cal/g/°C, latent heat of ice = 800 Cal/g)

Thetemperature of water will get reduced to..

experts please tommorrow is my aieee exam . please do it today only .... please give explanation too . because its too cnfusing .

please experts . thanks ....

self induction is called the inertia of electricity.why?

a) Non- inductive

b) capacitance dominated circuit

c) inductance dominated circuit

d) none of these

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

_{0}out of the page, find emf developed between two points of rod./$\left(1\right)\frac{1}{2}B\omega {l}^{2}\phantom{\rule{0ex}{0ex}}\left(2\right)B{\omega}^{2}\phantom{\rule{0ex}{0ex}}\left(3\right)\frac{3}{2}B\omega {l}^{2}\phantom{\rule{0ex}{0ex}}\left(4\right)Zero$

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.

1(e). Write down the Gauss's Law of magnetism as written in Maxwell's equation?

The 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.

Why a transformer cannot step up dc voltage?

1) 5

2) 20

3) 10

4) zero

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 :

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

can any please xplain ac generator?

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

identify the part of the electromagnetic spectrum which is

1.suitable for radar system used in aircraft navigation.

2.adjacent to low frequency end of the electromagnetic spectrum.

3.produced in nuclear reactions.

If a conducting coil is rotated on a frictionless axle, then it will rotate without any external couple. Suppose the coil is in a magnetic field and its circuit is not closed.

(a) Will there be potential difference across the coil?

(b)Will there current be induced in the coil?

(c)Will a couple be continuosly required to keep the coil rotating?

(d)What will be the effect on the motion of the coil on closing the circuit?

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 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?

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

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}CA starter motor of the car draws a current i=300A from the battery of voltage 12V. If the car starts only after 12min, what is the energy drawn from the battery.

2 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

Find the magnetic energy stored in the system of two concentric loops of radii r and R(Rr).If the loopss have currents of same magnitude i_{0}.Ignore the effect of self inductance.Ans={(pie)(mu)_{0}(ri_{0})^{2}}/2RA 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

derive an expression for sinusoidal emf and represent grafically the variation of emf with time.

An aeroplane is taking off with its wings along east -west direction, will there be any induced emf across its wings? Explain.

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

Q11.Which unit denotes the dimensions ML

^{2}T^{−2}A^{−1}?Weber (Wb)

Henry (H)

Wb/m

^{2}H/m

^{2}^{}i cant understand plz derive dimensional formula for all of above quantities.

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

A radio frequency choke is air cored whereas an audio frequency

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

Prove that E=1/2LI^2

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

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

For a closed rectagular loop, why do we say that the induced emf will be equal to Blv, even when this formula is valid for a rod and the loop will have 2 rods joined together? Shouldn't it be E=2.Blv? (coz there r 2 rods?)

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?

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.

44. In the last problem (i.e., Q. 43), the wire is shaped like a parabola y

^{2}^{ }= 4ax, at the instant the rod crosses the point (a, 0). Induced emf in the rod is(1) Bav (2) 2Bav

(3) 3Bav (4) 4Bav

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.

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

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 resistor, an inductor and a capacitor are connected in series with a 120V, 100Hz ac source. Voltage leads the current by 35 degree in the circuit. If the resistance of the resistor is 10 ohm and the sum of inductive and capacitive reactants is 17 ohm, calculate the self inductance if the inductor.

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 !

^{o}. Show this relationship graphically.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??

define impedence?