Beta Question Bank for Engineering: Physics>Chapter 26 - Matter and Magnetism>Exercise-1>Q 22

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The magnetic needle of a tangent galvanometer is deflected at an angle $30 °$ due to a magnet. The horizontal component of earth's magnetic field $0.34 \times 10^{- 4} T$ is along the plane of the coil. The magnetic field of coil is:

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Important Questions on Matter and Magnetism

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Beta Question Bank for Engineering: Physics>Chapter 26 - Matter and Magnetism>Exercise-1>Q 23

Which of the following demonstrated that earth has a magnetic fied:

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Beta Question Bank for Engineering: Physics>Chapter 26 - Matter and Magnetism>Exercise-1>Q 24

A bar magnet has a magnetic moment equal to

5 \times 10^{- 5} A - m^{2}

. It is suspended in a magnetic field which has a magnetic induction

B

equal to

8 π \times 10^{- 4}

Tesla. The magnet vibrates with a period of vibration equal to

15 \sec

. The moment of inertia of the magnet is

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Beta Question Bank for Engineering: Physics>Chapter 26 - Matter and Magnetism>Exercise-1>Q 25

A bar magnet of length $3 cm$ has points $A$ and $B$ along its axis at distances of $24 cm and 48 cm$ on the opposite sides. Ratio of magnetic fields as these points will be:

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Beta Question Bank for Engineering: Physics>Chapter 26 - Matter and Magnetism>Exercise-1>Q 26

In tangent galvanometer current for

30 °

deflection is

1 A,

then current necessary for

60 °

deflection is

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Beta Question Bank for Engineering: Physics>Chapter 26 - Matter and Magnetism>Exercise-1>Q 27

The reduction factor of tangent galvano mater is

' K' .

If its radius of coil make half and number of truns becomes doulbe then its value of reduction factor becomes:

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Beta Question Bank for Engineering: Physics>Chapter 26 - Matter and Magnetism>Exercise-1>Q 28

If a diamagnetic solution is poured into a

U

-tube and one arm of this

U

-tube placed between the poles of a strong magnet with the meniscus in a line with the field, then the level of the solution will

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Beta Question Bank for Engineering: Physics>Chapter 26 - Matter and Magnetism>Exercise-1>Q 29

A superconductor exhibits perfect :

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Beta Question Bank for Engineering: Physics>Chapter 26 - Matter and Magnetism>Exercise-1>Q 30

Which of the following statements is incorrect about hystersis: