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One coil with 40 turns and 4 "cm"^2 area...

One coil with 40 turns and `4 "cm"^2` area of cross-section is kept perpendicular to one uniform magnetic field of flux density B. When this loop is pulled out of magnetic field suddenly, `2 xx 10^(-4)` C electric charge flows through it. If resistance of this coil is 80`Omega` then B= ____ `"Wb/m"^2`.

A

0.5

B

1

C

1.5

D

2

Text Solution

Verified by Experts

The correct Answer is:
B
`q=(Deltaphi)/R`
`=(NAB)/R`
`therefore B=(qR)/(NA)`
`=(2xx10^(-4)xx80)/(40xx4xx10^(-4))`
`therefore B=1 "Wb/m"^2`
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KUMAR PRAKASHAN-ELECTROMAGNETIC INDUCTION-Section D MCQs (From DARPAN Based on Textbook )
  1. Above is the graph of current induced in a coil of resistance 10 Omega...

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

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

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  4. 2 A current is passed through a solenoid which has 5 cm diameter, 10 t...

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

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

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

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

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

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

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  11. Unit of magnetic flux density is

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

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  13. Eddy currents were invented by ...... scientist.

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

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

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

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  17. Eddy currents are produced, when

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  18. Eddy currents are produced

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  19. Eddy current do not cause……..

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  20. Induction furnace is based on the heating effect of .....

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