Recent questions tagged medium

A magnetic field that varies in magnitude from point to point but has a constant direction (east to west) is setup in a chamber . A charged particle enters the chamber and travels deflected along a straight path with constant speed . What can you say about the initial velocity of the particle ?

asked Jul 27, 2015 by meena.p

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A torroid has a core outer radius $26\;cm$ around which 3500 turns of a wire are wound . If the current in the wire is $11\;A$ , What is the magnetic field in the empty space surrounded by the torroid ?

asked Jul 27, 2015 by meena.p

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A torroid has a core outer radius $26\;cm$ around which 3500 turns of a wire are wound . If the current in the wire is $11\;A$ , What is the magnetic field, inside the core of the torriod .

asked Jul 27, 2015 by meena.p

1 answer

A torroid has a core outer radius $26\;cm$ around which 3500 turns of a wire are wound . If the current in the wire is $11\;A$ , What is the magnetic field, outside the torriod .

asked Jul 27, 2015 by meena.p

1 answer

For a circular coil of radius R and N turns carrying current $I$, the magnitude of the magnetic field at a point on its axis at a distance x from its center is given by $B= \large\frac{\mu_0 I R^2N}{2(x^2+R^2)^{3/2}}$ What will be the magnetic field at the center .

asked Jul 27, 2015 by meena.p

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A circular coil of $30 $ turns and radius $8.0 \;cm$ carrying a current of $6.0 \;A$ is suspended vertically in a uniform horizontal magnetic field of magnitude $1.0 \;T$.The field lines makes an angle of $60^{\circ}$ with the normal of the coil. Calculate the magnetic of the counter torque that must be applied to prevent the coil from turning .Would your answer change , if the circular coil is replaced by a planar coil of some irregular shape that encloses the same area?

asked Jul 24, 2015 by meena.p

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A circular coil of $30 $ turns and radius $8.0 \;cm$ carrying a current of $6.0 \;A$ is suspended vertically in a uniform horizontal magnetic field of magnitude $1.0 \;T$.The field lines makes an angle of $60^{\circ}$ with the normal of the coil. Calculate the magnetic of the counter torque that must be applied to prevent the coil from turning .

asked Jul 24, 2015 by meena.p

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In a chamber a uniform magnetic field of $6.5\;G(1G= 10^{-4})$ is maintained . An electron is short into the field with a speed of $4.8 \times 10^{6} m/s$ normal to the field , explain why the path of the electron is a circle Determine the radius of the circular orbit. $(e=1.6 \times 10^{-19} \;C,m_e= 9.1 \times 10^{-31} \;kg)$

asked Jul 24, 2015 by meena.p

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Two moving coil meters $M_1$ and $M_2$ having the following particulars .$R_1=10\Omega ,N_1=30, A_1= 3.6 \times 10^{-3}m^2,B_1=0.25 \;T,R_2=14\Omega ,N_2=42, A_2= 1.8 \times 10^{-3}m^2,B_2=0.50 \;T$ The spring constant are identical for the two meters . Determine the ratio of voltage sensitivity of $M_2$ and $M_1$

asked Jul 23, 2015 by meena.p

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Two moving coil meters $M_1$ and $M_2$ having the following particulars .$R_1=10\Omega ,N_1=30, A_1= 3.6 \times 10^{-3}m^2,B_1=0.25 \;T,R_2=14\Omega ,N_2=42, A_2= 1.8 \times 10^{-3}m^2,B_2=0.50 \;T$ $ The spring constant are identical for the two meters . Determine the ratio of current sensitivity ?

asked Jul 23, 2015 by meena.p

1 answer

A square coil of sides $10 \;cm$ consists of 20 turns and carries a current of $12 A$ . The coil is suspended vertically and the normal to $30^{\circ}$ with the direction of a uniform horizontal magnetic field of magnitude $0.80\;T$ . What is the magnitude of torque experienced by the coil ?

asked Jul 23, 2015 by meena.p

1 answer

A $3.0 \;cm$ wire carrying of $10\;A$ is placed inside a solenoid perpendicular to its axis . The magnitude field inside the solenoid is given to be $0.27 \;T$. What is the magnitude force on the wire ?

asked Jul 23, 2015 by meena.p

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A horizontal overhead power line carries a current of $90A$ in east to west direction . What is the magnitude of the magnetic field due to the current $1.5 m$ below the line .

asked Jul 22, 2015 by meena.p

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A long straight wire in the horizontal plane carries a current of $50\;A$ in north to south direction .What is the direction of B at a point $2.5\;m$ east of the wire ?

asked Jul 22, 2015 by meena.p

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A long straight wire in the horizontal plane carries a current of $50\;A$ in north to south direction . give the magnitude of B at a point $2.5\;m$ east of the wire

asked Jul 22, 2015 by meena.p

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A long straight wire carries a current of $35\;A$ what is the magnitude of the field B at a point $20\;cm$ away from the wire ?

asked Jul 22, 2015 by meena.p

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A circular coil of wire consisting of 100 times of radius $8.0\;cm$ carries a current of $0.40\;A$ What is the magnitude of the magnetic field B at the center of the coil ?

asked Jul 22, 2015 by meena.p

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The susceptibility of magnetism at book is $ 1.2 \times 10^{-5}$ At what temperature will the susceptibility be equal to $1.44 \times 10^5?$

asked Jul 22, 2015 by meena.p

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A circular coil of $300$ turns and diameter 14 cm carries a current of $15\;A$ . What is the magnitude of magnetic moment associated with the coil ?

asked Jul 22, 2015 by meena.p

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A short bar magnet is placed with its north pole pointing south . The natural point is $15\;cm$ away from the center of the magnet. If $H= 0.5 \;G$, Calculate the magnetic moment of the magnet.

asked Jul 22, 2015 by meena.p

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In a magnetic of a certain place, the horizontal component of the earth magnetic field is $0.26 \;G$ and dip angle is $60^{\circ}$ What is the magnetic field of earth at this location ?

asked Jul 22, 2015 by meena.p

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A magnetized steel wire $31.4\;cm$ long has pole strength of $0.2 \;Am$ It is then bent in the form of a semicircle. Calculate the magnetic moment of the needle.

asked Jul 21, 2015 by meena.p

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An electron and a proton equal momenta, enter a uniform magnetic field at right angles to the field lines. What will be the ratio of the radii of an vature of there trajectories .

asked Jul 21, 2015 by meena.p

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The earth's field departs from its dipole shape substantially at large distance (greater than about 30,000 km) What agencies may be responsible for this distortion ?

asked Jul 21, 2015 by meena.p

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Why do we prefer steel or alnico for making permanent magnets ?

asked Jul 21, 2015 by meena.p

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A coil of 200 turns has a cross -sectional area $900 mm^2$ . if carries a current of 2 ampere . The plane of the coil is perpendicular to a uniform magnetic field of $0.5 \;T$ Calculate the magnetic moment of the coil.

asked Jul 21, 2015 by meena.p

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State curies's law in magnetism?

asked Jul 21, 2015 by meena.p

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A magnetic needle of magnetic moment $4.8 \times 10^{-2}\;JT^{-1}$ is placed at $30^{\circ}$ with the direction of uniform magnetic field of magnitude $3 \times 10^{-2} \;T$ Calculate the torque acting on the needle

asked Jul 21, 2015 by meena.p

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A magnetized needle is placed $30^{\circ}$ with direction of uniform magnetic field of intensity $3 \times 10^{-2}\;T$ The torque acting on the needle is $7.2 \times 10^{-4} \;J$ Calculate the magnetic moment of the needle .

asked Jul 20, 2015 by meena.p

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The vertical component of earth magnetic field at a plane is $\large\frac{1}{\sqrt 3}$ times the horizontal component. What is the value of angle of dip at this place ?

asked Jul 20, 2015 by meena.p

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How does the pole strength of each part of bar magnet change if it is cut into equal piece along its length ?

asked Jul 20, 2015 by meena.p

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How does the magnetic moment of each part of the bar magnet change it is cut into two equal piece transverse to its length ?

asked Jul 20, 2015 by meena.p

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How does the pole strength of each part of a bar magnet change if it is cut into two equal pieces transverse to its length ?

asked Jul 20, 2015 by meena.p

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Assume the dipole model for earth's magnetic field B which is given by $B_v$ =Vertical component of magnetic field $=\large\frac{\mu_0}{4 \pi}.\frac{2m \cos \theta}{r}$ $B_H$= Horizontal component of magnetic field $\qquad= \large\frac{\mu_o}{4 \pi} \frac{\sin \theta m}{r^3}$ $\theta= 90^{\circ}$- latitude as measured from magnetic equator . Find loci of points for which dip angle is $\pm 45^{\circ}$

asked Jul 16, 2015 by meena.p

1 answer

Assume the dipole model for earth's magnetic field B which is given by $B_v$ =Vertical component of magnetic field $=\large\frac{\mu_0}{4 \pi}.\frac{2m \cos \theta}{r}$ $B_H$= Horizontal component of magnetic field $\qquad= \large\frac{\mu_o}{4 \pi} \frac{\sin \theta m}{r^3}$ $\theta= 90^{\circ}$- latitude as measured from magnetic equator . Find loci of points for which clip angle is zero.

asked Jul 16, 2015 by meena.p

1 answer

Assume the dipole model for earth's magnetic field B which is given by $B_v$ =Vertical component of magnetic field $=\large\frac{\mu_0}{4 \pi}.\frac{2m \cos \theta}{r}$ $B_H$= Horizontal component of magnetic field $\qquad= \large\frac{\mu_o}{4 \pi} \frac{\sin \theta m}{r^3}$ $\theta= 90^{\circ}$- latitude as measured from magnetic equator . Find loci of points for which $|B|$ is minimum

asked Jul 16, 2015 by meena.p

1 answer

A proton has spin and magnetic moment just line an electron , Why then its effect is neglected in magnetism of materials?

asked Jul 16, 2015 by meena.p

1 answer

A magnetic moment $\mu _s$ and $\mu_i$ associated with the intrinsic spin angular momentum $S$ and orbital momentum l respectively , of an electron are predicted by quantum theory (and verified experimentally to a high accuracy ) to be given by $\mu_s= -\bigg(\large\frac{e}{m} \bigg)$$s; \mu_e =-\bigg(\large\frac{e}{2m}\bigg)$$l$ Which of these relations is in accordance with the result expected classically ? outline the deviation of the classical result ?

asked Jul 16, 2015 by meena.p

1 answer

A rowland ring of mean radius $15\;cm$ has $3500$ turns of wire wound on a ferro magnetic core of relative permeability 800. What is the magnetic field B in the core for a magnetizing current of $12.A$?

asked Jul 15, 2015 by meena.p

1 answer

A mono energetic $(18\;kev)$ electron beam initially in the horizontal direction is subjected to a horizontal magnetic field of $0.4\;G$ normal to the initial direction . Estimate the up or down deflection of the beam over a distance of $30\;cm(m_e=9.11 \times 10^{-19}\;c)$

asked Jul 15, 2015 by meena.p

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A compass needle free to turn in a horizontal plane is placed at the center of circulaum coil of $30$ turns and radius $12\;cm$ . The coil is in a vertical plane making an angle of $45^{\circ}$ with the magnetic medician. when the current in the coil is $0.35\;A$ the needle points west to East. Determine the horizontal component of the earth's magnetic field at the location .

asked Jul 15, 2015 by meena.p

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A telephone cable at a place has four long straight horizontal wires carrying a current of $1.0 \;A$ in the same direction east to west. The earth magnetic field at the place is $ 0.39 \;G$ and the angle of dip is $35^{\circ}$. The magnetic declination is nearly zero. what are the resultant magnetic fields at points $ 4.0 \;cm$ above the cable ?

asked Jul 15, 2015 by meena.p

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A long straight horizontal cable carries a current of $2.5 \;A$ in the direction $10^{\circ}$ south of went to $10^{\circ}$ north of east . The magnetic meridian of the place happens to be $10^{\circ}$ west of the geographic meridian . The earth's magnetic field at the location is $ 0.33 \;G$ and the angle of the dip is zero. Locate the line of neutral points (ignore the thickness of the cable ). (At neutral point magnetic field due to current - carrying cable is equal and opposite to the horizontal component of earth's magnetic field )

asked Jul 15, 2015 by meena.p

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A certain region of space is to be shielded from magnetic fields. Suggest a method.

asked Jul 14, 2015 by meena.p

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A system displaying a hysteresis loop such as a ferromagnet, is a device for storing memory . explain the meaning of this statement.

asked Jul 14, 2015 by meena.p

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A short bar magnet of magnetic moment $5.25 \times 10^{-2}\;J/T$ is placed with its axis perpendicular to the earth's field direction . At what distance from the center of the magnet , the resultant field is inclined at $45^{\circ}$ with earth's field at the place is given to be $0.42\;G$ Ignore the length of the magnet in companion to the distance involved

asked Jul 14, 2015 by meena.p

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A short bar magnet placed in a horizontal plane has its axis aligned along the magnet north - south direction . Null points are found on the axis of the of the magnet at $14\;cm$ from the center of the magnet . The earth magnetic field at the place is $0.36\;G$ and the cycle of dip is zero. What is the total magnetic field on the normal bisector of the magnet at the same distance as the null - point (14 cm) from the centre of the magnet?

asked Jul 13, 2015 by meena.p

1 answer

A short magnet has a magnetic moments of $0.48\;J/T$. give the direction and magnitude of the magnetic field produced by the magnet of a distance of $10\; cm$ from the center of the magnet on the equatorial lines (normal bisector ) of the magnet .

asked Jul 13, 2015 by meena.p

1 answer

A short magnet has a magnetic moments of $0.48\;J/T$. give the direction and magnitude of the magnetic field produced by the magnet of a distance of $10\; cm$ from the center of the magnet on the axis

asked Jul 13, 2015 by meena.p

1 answer

At a certain location in Africa , a component points $12^{\circ}$ west of the geographic north. The north tip of the magnetic needle of a dip circle placed in the plane of magnetic meridian points $60^{\circ}$ and above the horizontal. The horizontal component of the earth's field is measured to be $0.16 \;G$ Specify the direction and magnitude of the earth's field at the location .

asked Jul 13, 2015 by meena.p

1 answer

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