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A bar magnet $20 cm$ in length is placed with its south pole towards geographical north. The neutral points are situated at a distance of $40 cm$ from centre of the magnet. If horizontal component of earth's field $3.2 \times 10^{- 5} Wb m^{- 2}$ , then pole strength of magnet is

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Important Questions on Magnetism and Matter

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Practice Book for MHT-CET Physics (Magnetism and Electromagnetic Induction)>Chapter 2 - Magnetism and Matter>Bar Magnet>Q 28

A dip needle lies initially in the magnetic meridian when it shows an angle of dip

θ

at a place. The dip circle is rotated through an angle

x

in the horizontal plane and then it shows an angle of dip

θ'

. Then,

\frac{\tan θ'}{\tan θ}

is,

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Practice Book for MHT-CET Physics (Magnetism and Electromagnetic Induction)>Chapter 2 - Magnetism and Matter>Bar Magnet>Q 29

A dip needle vibrates in the vertical plane perpendicular to the magnetic meridian. The time period of vibration is found to be

2 s

. The same needle is then allowed to vibrate in the horizontal plane and the time period is again found to be

2 s

. Then the angle of dip is

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Practice Book for MHT-CET Physics (Magnetism and Electromagnetic Induction)>Chapter 2 - Magnetism and Matter>Bar Magnet>Q 30

A magnet is suspended in such a way that it oscillates in the horizontal plane. It makes

20

oscillations per minute at a place where dip angle is

30 °

and

15

oscillations per minute at a place where dip angle is

60 °

. The ratio of the total earth's magnetic field at the two places is,

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Practice Book for MHT-CET Physics (Magnetism and Electromagnetic Induction)>Chapter 2 - Magnetism and Matter>Bar Magnet>Q 31

The true value of angle of dip at a place is

60 °

. The apparent dip in a plane inclined at an angle of

30 °

with magnetic meridian is

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Practice Book for MHT-CET Physics (Magnetism and Electromagnetic Induction)>Chapter 2 - Magnetism and Matter>Bar Magnet>Q 33

ϕ_{1}

and

ϕ_{2}

be the angles of dip observed in two vertical planes at right angles to each other and

ϕ

be the true angle of dip, then

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Practice Book for MHT-CET Physics (Magnetism and Electromagnetic Induction)>Chapter 2 - Magnetism and Matter>Bar Magnet>Q 34

A dip circle is adjusted so that its needle moves freely in the magnetic meridian. In this position, the angle of dip is

40 °

. Now the dip circle is rotated so that the plane in which the needle moves makes an angle of

30 °

with the magnetic meridian. In this position the needle will dip by an angle

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Practice Book for MHT-CET Physics (Magnetism and Electromagnetic Induction)>Chapter 2 - Magnetism and Matter>Bar Magnet>Q 35

If the angle of dip at two places are

30 °

and

45 °

respectively, then the ratio of horizontal component of earth's magnetic field at two places will be

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Practice Book for MHT-CET Physics (Magnetism and Electromagnetic Induction)>Chapter 2 - Magnetism and Matter>Bar Magnet>Q 36

The value of earth magnetic field

B_{H} = 0.3 G

. In this magnetic field a magnet is oscillating with

5 oscillations \min^{- 1}

. To increase the oscillation of magnet upto

10 oscillations \min^{- 1}

, the value of earth magnetic field is increased by

A bar magnet 20 cm in length is placed with its south pole towards geographical north. The neutral points are situated at a distance of 40 cm from centre of the magnet. If horizontal component of earth's field 3.2×10-5 Wb m-2, then pole strength of magnet is

Important Questions on Magnetism and Matter

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A bar magnet $20 cm$ in length is placed with its south pole towards geographical north. The neutral points are situated at a distance of $40 cm$ from centre of the magnet. If horizontal component of earth's field $3.2 \times 10^{- 5} Wb m^{- 2}$ , then pole strength of magnet is