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In circular coil. when no. of turns is doubled & resistance becomes half of the initial then inductance

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In the figure the magnetic energy stored in the coil

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When the switch S turned

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A transformer of efficiency 90% draws an input power of 4 kW. An electrical applience connected across the secondary draws a current of 6 A.The impedence of device

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The armature of dc motor has `20Omega` resistance. It draws current of 1.5 A when run by 220 V dc suppy. The value of back induced in it will

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

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A thin semicircular conducting ring of radius R is falling in a magnetic field B. Which is in limited area as shown in figure. At the position MNQ,the speed of ring is `v` and the potential difference developed across the ring

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

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Two identical circular loops of metal wire are lying on a table near to each other without touching.Loop A carries a current which increasing with time.In response the loop

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A wire of length 2m is moving at a speed `2ms^(-1)` keep its length perpendicular to uniform magnetic field of 0.5 T. The resistance of circuit joined with this wire is `6Omega`. The rate at which wolrk is being done to keep the wire moving at constant speed is

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

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Two identical magnets moving towards a coil, connecting a condenser at rear side shown in fig., with equal speed from opposite sides

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A rectangular loop with a sliding rod of length 2m & resistance `2Omega`. It moves in a uniform magnetic field of 3T perpendicular to plane of loop. The external force required to keep the rod moving with constant velocity of `2ms^(-1)`

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

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A conducting rod PQ of length `4l` is rotated about a point O in a uniform magnetic field `vecB . PO=l`

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As shown in figure after a long time the battery is disconnected and short circuiting the points A & B. The current in circuit after 2ms after the short circuit

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

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The variation of induced emf with time in a coil if a short bar magnet is moved along its axis with constant velocity

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A square loop of side 10 cm and resistance `2_Omega` is moved with velocity `v_o` as shown in fig. The uniform magnetic field is 3T with what speed should the loop be moved so that a steady current of 1.5 mA flows in the

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

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An inductor-resistor-battery circuit is switched on at t = 0. If the emf of battry is `epsilon` find the charge passes through the battery in one time constant

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

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A square loop of side 5 cm being moved right at a constant speed `2cms^(-1)` .The front edge of it enters in magnetic field at t = 0.Fined the induced emf in the loop at t = 1s, 5s,

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The time constant of a LR circuit is 20 ms The circuit is connected at t = 0 and the steady state current is found to be 4A. Find the current at 80

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A metal rod of length 2 m rotates vertically about one of its end with frequency 2 Hz. The horizontal component of earth's magnetic field is `3.14xx 10^(-5)` then emf developed between two ends of road

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In the following circuit the bulb will become suddenly bright

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The self inductance of a coil is 5H, a current of 1A changes to 2A within 5 sec. through the coil. The value of induced emf will

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