Recent questions tagged ch-5

A closely wound solenoid of $2000$ turns and area of cross section $1.6 \times 10^{-4}m^2$, carrying a current of $4.0\;A$ is suspended through its center allowing it to turn in a horizontal plane. What is the magnetic moment associated with the solenoid ?

asked Jul 10, 2015 by meena.p

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A bar magnet of magnetic moment $1.5\;J/T$ lies aligned with the direction of a uniform magnetic field of $0.22\;T$ What is the amount of work required by an external torque to turn the magnet so as to align its magnetic moment, opposite to the field direction ?

asked Jul 10, 2015 by meena.p

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A bar magnet of magnetic moment $1.5\;J/T$ lies aligned with the direction of a uniform magnetic field of $0.22\;T$ What is the torque on the magnet when the magnet aligns normal to the field direction ?

asked Jul 10, 2015 by meena.p

1 answer

A bar magnet of magnetic moment $1.5\;J/T$ lies aligned with the direction of a uniform magnetic field of $0.22\;T$ What is the amount of work required by an external torque to turn the magnet so as to align its magnetic moment, opposite to the field direction ?

asked Jul 10, 2015 by meena.p

1 answer

A bar magnet of magnetic moment $1.5\;J/T$ lies aligned with the direction of a uniform magnetic field of $0.22\;T$

asked Jul 10, 2015 by meena.p

1 answer

If the solenoid in the above question is free to turn about the vertical direction and a uniform magnetic field of $0.25 \;T$ is applied , what is the magnitude of torque on the solenoid when its axis makes an angle of $30^{\circ}$ with the direction of applied field.

asked Jul 10, 2015 by meena.p

1 answer

A closely wound solenoid of 800 turns and area of cross section $2.5 \times 10^{-4} \;m^2$ carries a current of $3.0 \;A$Explain the same in which the solenoid acts like a bar magnet . What is its associate magnetic moment ?

asked Jul 10, 2015 by meena.p

1 answer

A short bar magnet of magnetic moment $m= 0.32 \;J/T$. is placed in a uniform magnetic field of $0.15 \;T$. If the bar is free to rotate in the plane of the field, Which orientation would correspond to its unstable equilibrium ? What is the potential energy of the magnet?

asked Jul 10, 2015 by meena.p

1 answer

A short bar magnet of magnetic moment $m= 0.32 \;J/T$. is placed in a uniform magnetic field of $0.15 \;T$. If the bar is free to rotate in the plane of the field, Which orientation would correspond to its stable equilibrium ? What is the potential energy of the magnet?

asked Jul 10, 2015 by meena.p

1 answer

A short bar magnet with its axis at $30^{\circ}$ with a uniform external magnetic field of $0.25\;T$ experiences a forque a magnitude equal to $4.5 \times 10^{-2}\;J$ What is the magnitude of magnetic moment of the magnet?

asked Jul 10, 2015 by meena.p

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Instellar space has an excellently weak magnetic field of the order of $10^{-12}\;T$ can such a weak field be of any significant consequence. Explain

asked Jul 10, 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 10, 2015 by meena.p

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The earth may have reversed the direction of its field several times during its history of 4 to 5 billion years. How can geologists know about the earth field in such distant past ?

asked Jul 9, 2015 by meena.p

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The charged currents in the outer conducting regions of the earth core are thought to be responsible for earth's magnetism. What might be the battery (ie the cource of energy ) to sustain these currents ?

asked Jul 9, 2015 by meena.p

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The earth's core is known to contain iron. yet geologists do not regard this as a source of the earth mergnetisum . Why ?

asked Jul 9, 2015 by meena.p

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The earth's magnetic field from point to point in space . Does it also charge with time ? If so on what time scale does it change appreciably ?

asked Jul 9, 2015 by meena.p

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Geologist claim that besides the main magnetic N-S poles, there are several local poles on the earth's surface oriented in different direction . How is such a thing possible at all ?

asked Jul 9, 2015 by meena.p

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In which direction would a compass free to move in the vertical plane point to, if located right on the geomagnetic north or south pole ?

asked Jul 9, 2015 by meena.p

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The earth's field it is claimed roughly approximately the field due to a dipole of magnetic moment $8 \times 10^{22}J/T$ located at its centre. Check the order of magnitude of this number is same way

asked Jul 9, 2015 by meena.p

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If you made a map of magnetic field line at Melbourne in Australian, would the line seem to go into the ground or come out the ground ?

asked Jul 9, 2015 by meena.p

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The angle of dip at a location in southern India is about $18^{circ}$ would you expect a greater or smaller dip in Britain ?

asked Jul 9, 2015 by meena.p

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A vector needs three quantities for its specification . Name the three independent quantities conventionally used to specify the earth's magnetic field ?

asked Jul 9, 2015 by meena.p

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$36$ is multiplied by x to get a perfect cube. The value of x is

asked Apr 21, 2015 by meena.p

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The cube root of $1.331$ is

asked Apr 21, 2015 by meena.p

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$\large\frac{\sqrt[3]{0.512}}{x} $$= \sqrt[3]{1000}$ then the value of x is

asked Apr 21, 2015 by meena.p

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By what the least number should $4000$ be divided so as to obtain a number which is a perfect cube .

asked Apr 21, 2015 by meena.p

1 answer

By what the least number should $675$ be multiplied so as to obtain a number which is a perfect cube .

asked Apr 21, 2015 by meena.p

2 answers

The largest 4 digit number which is a perfect cube is

asked Apr 20, 2015 by meena.p

1 answer

The cube root of $0.000512$ is

asked Apr 20, 2015 by meena.p

1 answer

Find the volume of a cube whose edge is $2.5\;cm$

asked Apr 20, 2015 by meena.p

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What is the edge of a cube whose volume is $1348\;cm^3$

asked Apr 20, 2015 by meena.p

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Which of the following is the perfect cube ?

asked Apr 20, 2015 by meena.p

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The cube of $149$ one's digit is

asked Apr 20, 2015 by meena.p

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A Perfect cube number does not end with ________ zeros.

asked Apr 20, 2015 by meena.p

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In the prime factorization of any number each factor appears three times , then the number is

asked Apr 20, 2015 by meena.p

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What is the smallest number by which $392$ must be multiplied so that the product is a perfect cube .

asked Apr 20, 2015 by meena.p

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If a cube has a surface area of $6144\;m^2$ then the volume of the cube , is ________ $m^3$

asked Apr 20, 2015 by meena.p

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Solve : $\sqrt{ (45^2+28^2)^3}$

asked Apr 20, 2015 by meena.p

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What is the value of $ \sqrt[3]{\large\frac{-216}{2197}}$

asked Apr 20, 2015 by meena.p

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what is the value of $\sqrt[3]{\large\frac{1728}{24389}}$

asked Apr 20, 2015 by meena.p

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If you subtract a number x from 16 times that number and then take the cube of the difference . What will be the result.

asked Apr 20, 2015 by meena.p

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The volume of a cube is $9261000\;m^3$ . Find the side of the cube .

asked Apr 20, 2015 by meena.p

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Sheetal makes a cuboid of sides $5\;cm,2\;cm$ and $5\;cm$. How many such cuboids will she need to form a cube ?

asked Apr 20, 2015 by meena.p

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Evaluate : $\sqrt[3]{700 \times 2 \times 49 \times 5}$

asked Apr 20, 2015 by meena.p

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Evaluate : $\sqrt[3] {8 \times 17\times 17 \times 17}$

asked Apr 20, 2015 by meena.p

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Find the smallest number by which $12500$ must be multiplied so that the product is a perfect cube

asked Apr 20, 2015 by meena.p

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Find the number Whose cube is $9261$

asked Apr 20, 2015 by meena.p

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The cube of a negative number is

asked Apr 20, 2015 by meena.p

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The side of a cube are doubled . Find the ratio between the volume of the first cube and the new cube.

asked Apr 20, 2015 by meena.p

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Find the smallest number by which $3456$ must be divided so that the quotient becomes a perfect cube .

asked Apr 20, 2015 by meena.p

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