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Two parallel rails of a railway track insulated from each other and with the ground are connected to a millivoltmeter. The distance between the rails is one metre. A train is traveling with a velocity of `72 km ph` along the track. The reading of the millivoltmetre (in `m V`) is : (Vertical component of the earth's magnetic induction is `2 xx 10^(-5) T`)

A

1.44

B

0.72

C

0.4

D

0.2

Text Solution

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The correct Answer is:
C
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AAKASH INSTITUTE-ELECTROMAGNETIC INDUCTION-Assignment (SECTION - A)
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  2. Dimensional formula of self-inductance is

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  3. A time varying magnetic flux passing through a coil is given by phi=xt...

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  4. A metalic ring is dropped down, keeping its plane perpendicular to a c...

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  5. Lights of a car become dim when the starter is opereterd. Why?

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  6. Coefficient of coupling between two coils of self-inductances L(1) and...

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  7. There is a uniform magnetic field directed perpendicular and into the ...

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  8. A square loop of wire with side length 10 cm is placed at angle of 45^...

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  9. A uniformly wound solenoid coil of self inductance 1.8xx10^(-4)H and r...

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  10. The magnitude opf the earth's magnetic field at a place is B(0) and th...

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  11. Two parallel rails of a railway track insulated from each other and wi...

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  12. Answer the following questions : (a) When a low flying aircraft pass...

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  13. Electric field induced by changing magnetic fields are

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  14. A circular loop of radius R, carrying current I, lies in x-y plane wit...

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  15. A helicopter rises vertically upwards with a speed of 100 m//s. If the...

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  16. The energy stored in an inductor of self inductance L carrying current...

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  17. An electric motor runs a D.C. source of e.m.f. 200 V and draws a curre...

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  18. Induction furnace is based on the heating effect of

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  19. Two identical circular loops of metal wire are lying on a table withou...

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  20. A short solenoid of length 4 cm, radius 2 cm and 100 turns is placed i...

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