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Above is the graph of current induced in...


Above is the graph of current induced in a coil of resistance 10 `Omega` , because of change of magnetic flux, versus time. Then change of magnetic flux is …….. Wb.

A

8

B

2

C

0

D

6

Text Solution

Verified by Experts

The correct Answer is:
B
`Q=(Deltaphi)/R`
`therefore Deltaphi=QR`
`therefore Deltaphi=ItR " " [because Q=It]`
`therefore DeltaQ` = (Area enclosed under I `to` t graph ) (resistance)
`therefore Deltaphi=1/2xx4xx0.1xx10`
`therefore Deltaphi`=2 Wb
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KUMAR PRAKASHAN-ELECTROMAGNETIC INDUCTION-Section D MCQs (From DARPAN Based on Textbook )
  1. I amount of current is passed through a coil with N turns. Magnetic fl...

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  2. Magnetic flux linked with one closed conducting loop is phi=t^2+3t-7. ...

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  3. Above is the graph of current induced in a coil of resistance 10 Omega...

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  4. Magnetic flux linked with one coil changes with time t is phi=xt^2 . I...

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  5. One coil with 40 turns and 4 "cm"^2 area of cross-section is kept perp...

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  6. 2 A current is passed through a solenoid which has 5 cm diameter, 10 t...

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  7. A circular loop of radius R is placed in the uniform magnetic field. T...

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  8. vecB is the magnetic field perpendicular to the plane of the coil, the...

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  9. When alpha is the angle between plane of the coil and magnetic field ...

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  10. A magnetic field in a certain region is given by vecB = (40hatî - 18 h...

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  11. A solenoid 600 mm long has 50 turns on it and its wound on an iron rod...

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  12. A square loop of size 2 cm is lying on a horizontal surface. A uniform...

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  13. Unit of magnetic flux density is

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  14. A magnetic field in a certain region is given by vecB = (40hatî - 18 h...

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  15. Eddy currents were invented by ...... scientist.

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  16. When eddy currents are produced in the conductor, electrons in that co...

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  17. Lenz force acting on a conducting rod moving in a magnetic field is

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  18. One metallic plate, oscillates perpendicular to magnetic field between...

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  19. Eddy currents are produced, when

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  20. Eddy currents are produced

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