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There are two coils A and B seperated by some distance. If a current of 2 A flows through A, a magnetic flux of 10-2 Wb passes through B (no current through B). If no current passes through A and a current of 1 A passes through B, what is the flux through

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A magnetic field ` hatB = B_o sin( ωt) hat k` covers a large region where a wire AB slides smoothly over two parallel conductors separated by a distance d (Fig.). The wires are in the x-y plane. The wire AB (of length d) has resistance R and the parallel wires have negligible resistance. If AB is moving with velocity v, what is the current in the circuit. What is the force needed to keep the wire moving at constant

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A conducting wire XY of mass m and neglibile resistance slides smoothly on two parallel conducting wires as shown in Fig . The closed circuit has a resistance R due to AC. AB and CD are perfect conductors. There is a magnetic field` B = B(t )hatk` . Write

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A conducting wire XY of mass m and neglibile resistance slides smoothly on two parallel conducting wires as shown in Fig . The closed circuit has a resistance R due to AC. AB and CD are perfect conductors. There is a magnetic field` B = B(t )hatk` . If

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A conducting wire XY of mass m and neglibile resistance slides smoothly on two parallel conducting wires as shown in Fig . The closed circuit has a resistance R due to AC. AB and CD are perfect conductors. There is a magnetic field` B = B(t )hatk` . For

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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ODBAC is a fixed rectangular conductor of negilible resistance (CO is not connnected) and OP is a conductor which rotates clockwise with an angular velocity ω (Fig ). The entire system is in a uniform magnetic field B whose direction is along the normal to the surface of the rectangular conductor ABDC. The conductor OP is in electric contact with ABDC. The rotating conductor has a resistance of λ per unit length. Find the current in the rotating conductor, as it rotates by

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Consider an infinitely long wire carrying a current I (t ), with` dI/ dt = λ = constant`. Find the current produced in the rectangular loop of wire ABCD if its resistance is R (Fig.

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A rectangular loop of wire ABCD is kept close to an infinitely long wire carrying a current` I (t ) = I_o (1 – t /T ) `for 0 ≤ t ≤ T and `I (0) = 0 'for' t > T` (Fig. ). Find the total charge passing through a given point in the loop, in time T. The resistance of the loop is R.

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A magnetic field B is confined to a region r ≤ a and points out of the paper (the z-axis), r = 0 being the centre of the circular region. A charged ring (charge = Q) of radius b, b > a and mass m lies in the x-y plane with its centre at the origin. The ring is free to rotate and is at rest. The magnetic field is brought to zero in time Δt. Find the angular velocity ω of the ring after the field

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A rod of mass m and resistance R slides smoothly over two parallel perfectly conducting wires kept sloping at an angle θ with respect to the horizontal (Fig. ). The circuit is closed through a perfect conductor at the top. There is a constant magnetic field B along the vertical direction. If the rod is initially at rest, find the velocity of the rod as a function of

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Find the current in the sliding rod AB (resistance = R) for the arrangement shown in Fig . B is constant and is out of the paper. Parallel wires have no resistance. v is constant. Switch S is closed at time t =

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Find the current in the sliding rod AB (resistance = R) for the arrangement shown in Fig . B is constant and is out of the paper. Parallel wires have no resistance. v is constant. Switch S is closed at time t = 0.

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A metallic ring of mass m and radius l (ring being horizontal) 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

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A long solenoid ‘S’ has ‘n’ turns per meter, with diameter ‘a’. At the centre of this coil we place a smaller coil of ‘N’ turns and diameter ‘b’ (where b < a). If the current in the solenoid increases linearly, with time, what is the induced emf appearing in the smaller coil. Plot graph showing nature of variation in emf, if current varies as a function of mt2 +

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A coil having area `2m^2` is placed in a magnetic field which changes from 1 wb /`m^2` to 4 wb/`m^2` in an interval of 2 second. The emf induced in the coil of single turn

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Two different loops are concentric & lie in the same plane. The current in outer loop is clockwise & increasing with time. The induced current in the inner loop then,

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A ring of radius r is rotating about its diameter with angular velocity `omega` in a perpendicular magnetic field `vecB` It has 20turns.The emf induced

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A magnetic field `2xx 10^(-2) T` acts at right angles to a coil of area `200 cm^2` with 25 turns. The average emf induced in the coil is 0.1 v when it removes from the field in time t. The value of t

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The magnetic flux linked with a coil, in webers, is given by the equation `phi=4t^2- 3t+ 7` . Then the magnitude of induced emf at 2 sec will be

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A solenoid of 1.5 m long with inner diamter of 4 cm has three layers of windings of 1000 turns each & carries a current of 2 A. The magnetic flux through a cross section of the solenoid is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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