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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,

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

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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

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

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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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Pure inductance of 3H each are connected as shown below. The equivalent inductance of the circuit

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A coil of inductance 300 mH and resistance `2Omega` is connected to a source of voltage 2V. The current reaches half of its steady state value

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

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If rotational velocity of a dynamo armature is doubled, then induced emf will become...What is increased in step down transformer

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The core of a transformer is laminated so

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In transformer, core is made of soft iron to

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An ideal transformer has 1:25 turn ratio. The peak value of the ac is 28 V. The rms ms secondary voltage is nearest

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A primary winding of transformer has 500 turns whereas its secondary has 5000 turns. Primary is connected to ac supply of 20V, 50Hz The secondary output

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