Recent questions tagged #mcq

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When a train travels with a speed `360 km h^(-1)` along the track separated by 1 meter. The vertical component of earth's magnetic field is `0.1xx 10^(-4) T` .What is the value of induced emf between the rails

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

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An electron moves along the line AB,which lies in the same plane as a circular loop of conducting wires as shown in figure. What will be the direction of current induced if any, in the loop

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

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A circular loop of radius R carrying current I lies in X-Y plane with its centre at origin. The total magnetic flux through x-y plane

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

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Consider the situation shown in the figure. The wireAB is sliding on the fixed rails with a constant velocity `vecv` . If the wire AB replaced by semi circular wire the magnitude of the induced current

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

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

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When the number of turns in a coil is make four time without any change in length of the coil, its self inductance

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

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A metal road moves at a constant velocity in a direction perpendicular to its length & a constant uniform magnetic field too. Select the correct statement (s) from the

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

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Two co-axial solenoids are made by a pipe of cross sectional area `10 cm^2` and length 20 cm If one of the solenoid has 300 turns and the other 400 turns, their mutual inductance

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

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The self inductance of a straight conductor

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

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Two coils of self inductances 2 mH & 8 mH are placed so close togather that the effective flux in one coil is completely half with the other.The mutual inductance between these coils

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

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

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

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In the figure the magnetic energy stored in the coil

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

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When the switch S turned

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

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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

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

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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

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

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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

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

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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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