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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?

6. A conducting rod PQ of length 'l' connected to a resistor R, is moved at a uniform speed v, normal to a uniform magnetic field B as shown in the figure. (i) Deduce the expression for the emf induced in the conductor.

(ii) Find the force required to move the rod in the magnetic field.

(iii) Mark the direction of induced current in the conductor.

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

self induction is called the inertia of electricity.why?

^{o}. Show this relationship graphically.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.

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

Why a transformer cannot step up dc voltage?

(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 ?.

^{o}about it's one of the diameters in 2 seconds. Find the rate of change of magnetic flux through the coil.Prove that an ideal inductor does not dissipate power in an a.c circuit.

i) Deduce the expression for the emf induced in the conduction.

ii) Find the force required to move the rod in the magnetic field.

iii) Mark the direction of induced current in the conductor

can any please xplain ac generator?

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

description about dead beat galvanometer

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

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

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

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

(1) ${A}^{1}$

(2) ${A}^{-1}$

(3) ${A}^{0}$

(4) ${A}^{-2}$

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}C(1) $\frac{3g}{4}$

(2) $\frac{4g}{3}$

(3) $\frac{2g}{3}$

(4) $\frac{3g}{2}$

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

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?

(1) ${n}^{2}$

(2) n

(3) ${n}^{4}$

(4) ${n}^{\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$4$}\right.}$

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...

For r > ${r}_{1}$, force is

(1) Attractive

(2) Repulsive

(3) Zero

(4) May be attractive, repulsive or zero

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 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 ?

Derivation for Energy Stored in an INDUCTOR

A radio frequency choke is air cored whereas an audio frequency

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

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)

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.

Define fringe width, Derive an expression for fringe width in youngâ€™sdouble slitexperiment.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.

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?

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 circular coil of 500 turns of wire has an enclosed area of 0.1m square per turn. it is kept perpendicular to a magnetic field of induction 0.2 T and rotated by 180 degree about a diameter perpendicular to the field in 0.1 sec. how much charge will pass when the coil is connected to a galvanometer with a combined resistance of 50 ohms

0.2c

0.4c

2c

4c

A metallic wire 1m in length is moving normally across a field of 0.1 T with a speed of 5 ms-1 find the emf between the ends of the wire.

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

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

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

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 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..

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.

(Answer 2L)

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

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

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) â€‹There will be no induced emf in the rod

(d) â€‹Potential at A will be higher than that at B.