Recent questions tagged ch-4

In a cyclotron, a changed particle

asked Jul 29, 2015 by meena.p

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An electron is projected with uniform velocity at the axis of a current carrying long solenoid. Which of the following is true ?

asked Jul 29, 2015 by meena.p

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A current carrying circular loop of radius R is placed in the x-y plane with center at the orgin . Half of the loop with $ x >0$ is now bent so that it now lies in the $y-z$ plane .

asked Jul 29, 2015 by meena.p

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Biot -savart law indicates that the moving electrons (velocity $\overrightarrow{v}$) produce a magnetic field $\overrightarrow{B}$ such that

asked Jul 29, 2015 by meena.p

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Two changed particles traverse identical helical paths in a completely opposite sense in a uniform magnetic field $\overrightarrow{B} =B_0 \hat k$

asked Jul 29, 2015 by meena.p

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A galvanometer coil has a resistance of $15 \Omega$ and the meter shows full deflection scale for a current of $4\;mA$ . How will you convert the meter into a voltmeter of range $0\; to\; 6\;A$ ?

asked Jul 29, 2015 by meena.p

1 answer

A galvanometer coil has a resistance of $12 \Omega$ and the meter shows full scale deflection for a current of $3\;mA$ . How will you convert the meter into a voltmeter of range $0\; to\; 18\;V$ ?

asked Jul 29, 2015 by meena.p

1 answer

A solenoid 60 cm long and radius $4.0\;cm$ has 3 layers of winding of 300 turns each . A 2.0 cm long wire of mass $2.5 \;g$ inside the solenoid (near its center) normal to its axis, both the wire and the axis of the solenoid are in the horizontal plane. The wire is connected through two leads parallel to the axis of the solenoid to the external battery which supplies a current of $6.0$ in the sense of circulation ) in the windings of the solenoid can support the weight of the wire $(g= 9.8 m/g^2)$

asked Jul 29, 2015 by meena.p

1 answer

A circular coil of 20 turns and radius $10\;cm$ is placed in a uniform magnetic field of $0.10\;T$ normal to the plane of the coil. If the current in the coil is $5.0 \;A$ What is the average force on each electron in the due to the magnetic field ?

asked Jul 29, 2015 by meena.p

1 answer

A circular coil of 20 turns and radius $10\;cm$ is placed in a uniform magnetic field of $0.10\;T$ normal to the plane of the coil. If the current in the coil is $5.0 \;A$ What is the total force on the coil ?

asked Jul 28, 2015 by meena.p

1 answer

A circular coil of 20 turns and radius $10\;cm$ is placed in a uniform magnetic field of $0.10\;T$ normal to the plane of the coil. If the current in the coil is $5.0 \;A$ What is the total torque on the coil ? (The coil is made of copper wire of cross sectional area $`10^{-5}\;m^2$ and the free electron density is given to be $10^{29}/m^3$

asked Jul 28, 2015 by meena.p

1 answer

A uniform magnetic field of $3000\;G$ is established along the positive z- direction . A rectangular loop of sides $10\;cm$ and $5\;cm$carries a current of $12\;A$. What is the torque on the loop in the case as shown in the figure? What is the force in this case ?

asked Jul 28, 2015 by meena.p

1 answer

A uniform magnetic field of $3000\;G$ is established along the positive z- direction . A rectangular loop of sides $10\;cm$ and $5\;cm$carries a current of $12\;A$. What is the torque on the loop in the case as shown in the figure? What is the force in this case ?

asked Jul 28, 2015 by meena.p

1 answer

A uniform magnetic field of $3000\;G$ is established along the positive z- direction . A rectangular loop of sides $10\;cm$ and $5\;cm$carries a current of $12\;A$. What is the torque on the loop in the given fig? What is the force in this case?

asked Jul 28, 2015 by meena.p

1 answer

A uniform magnetic field of $3000\;G$ is established along the positive z- direction . A rectangular loop of sides $10\;cm$ and $5\;cm$carries a current of $12\;A$. What is the torque on the loop in the fig? What is the force in this case ?

asked Jul 28, 2015 by meena.p

1 answer

A uniform magnetic field of $3000\;G$ is established along the positive z- direction . A rectangular loop of sides $10\;cm$ and $5\;cm$carries a current of $12\;A$. What is the torque on the loop in the fig? What is the force in this case? Does state correspond to equilibrium ?

asked Jul 28, 2015 by meena.p

1 answer

A uniform magnetic field of $3000\;G$ is established along the positive z- direction . A rectangular loop of sides $10\;cm$ and $5\;cm$carries a current of $12\;A$. What is the torque on the loop in the fig? What is the force ?

asked Jul 28, 2015 by meena.p

1 answer

A uniform magnetic field of $1.5 \;T$ exists a cylindrical region $10.0 \;cm$ its direction parallel to the axis along east to west. A wire carrying current of $7.0 \;A$ in the north to south direction passes through this region . What is the magnitude and direction of the force of the wire if the wire in the N-S direction is lowered from the axis by a distance of $6.0 \;cm$? intended the axis ?

asked Jul 28, 2015 by meena.p

1 answer

A uniform magnetic field of $1.5 \;T$ exists a cylindrical region $10.0 \;cm$ its direction parallel to the axis along east to west. A wire carrying current of $7.0 \;A$ in the north to south direction passes through this region . What is the magnitude and direction of the force on the wire if the wire is turned from N-S to north east -north west direction ?

asked Jul 28, 2015 by meena.p

1 answer

A uniform magnetic field of $1.5 \;T$ exists a cylindrical region $10.0 \;cm$ its direction parallel to the axis along east to west. A wire carrying current of $7.0 \;A$ in the north to south direction passes through this region . What is the magnitude and direction of the force of the wire is the wire intended the axis ?

asked Jul 28, 2015 by meena.p

1 answer

The wires which connected the battery of an automobile to its starting motor carrying a current of $300\;A$ (for a short time ). What is the force per unit length between the wires , if they are $70\;cm$long and $1.5 \;cm$ apart? Is the force attractive or repulsive ?

asked Jul 28, 2015 by meena.p

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A straight horizontal conducting rod of length $0.45\;m$ and mass $60\;g$ is suspended by two vertical wires at its ends. A current of $5.0\;A$ is setup in the rod through the wires . What will be the total tension in the wires if the direction of current is reversal keeping the magnetic field normal to the conductor in order that the tension in the wires is zero?(Ignore the mass of wires ) $g= 9.8 \;m/s^2$

asked Jul 28, 2015 by meena.p

1 answer

A straight horizontal conducting rod of length $0.45\;m$ and mass $60\;g$ is suspended by two vertical wires at its ends. A current of $5.0\;A$ is setup in the rod through the wires . What magnetic field should be setup normal to the conductor in order that the tension in the wires is zero?

asked Jul 28, 2015 by meena.p

1 answer

A magnetic field using using Helmholtz coils is uniform in a small region and has a magnitude of $0.75\;T$ .In the same region a uniform electrostatic field is maintained in a direction normal to the common axis of the coils. A narrow beam of (single species) changed particles all accelerated through $15\;KV$ enters this region in a direction perpendicular to both the axis of the coils and the electrostatic field. If the beam remains undetected when the electro static field is $9 \times 10^{-5}V/m$ making a simple guess as to what the beam contains . Is the answer unique?

asked Jul 27, 2015 by meena.p

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An electron travelling west to east enters a chamber having a uniform electrostatic field in north to south direction . specify the direction in which a uniform magnetic field should be set up to prevent electron from deflecting its straight line path .

asked Jul 27, 2015 by meena.p

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A changed particle enters an environment of strong and non- uniform magnetic field varying from point to point both in magnitude and direction , and comes out of it following a complicated trajectory would its final speed equal the initial speed, if it suffered no collision with the environment ?

asked Jul 27, 2015 by meena.p

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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

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 in the empty space surrounded by the torroid ?

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, 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

1 answer

Two Concentric circular coils x and y of radii $16\;cm$ and $10\;cm$ respectively lie in the same vertical plane containing the north to south direction . coil x has 20 turns and carries a current of $16\;A$ coil y has 25 turns and carries a current of 18 A. The sense of the current in x is anticlock and clock wise in y, for an observe looks at the coils facing west. Find the magnitude and direction of the net magnetic force due to the coils at their center.

asked Jul 27, 2015 by meena.p

1 answer

A magnetic field of $100\;G(1G= 10^{-4}\;T)$ is required which is uniform in a region of linear dimension about $10\;cm$ and area of cross section about $10^{-3}\;cm$ and the maximum current carrying capacity of a given coil of wire is $15\;A$ and the number of turns per unit length that can be round a core is at most $1000 turns/ m$ Same appropriate design particulars of a solenoid for the required purpose . Assume the core is not ferromagnetic .

asked Jul 24, 2015 by meena.p

1 answer

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

1 answer

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

1 answer

Obtain the frequency of revolution of the electron in its circular orbit. Does the answer depends on the speed of the electron ? Explain

asked Jul 24, 2015 by meena.p

1 answer

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

1 answer

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

1 answer

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 closely ward solenoid $80\;cm$ long has $ 5$ layers of winding of 400 turns each.The diameter of the solenoid is $1.8 \;cm$ . If the current carried is $8.0\;A$ , What will be the direction of B B inside the solenoid near its center .

asked Jul 23, 2015 by meena.p

1 answer

A closely ward solenoid $80\;cm$ long has $ 5$ layers of winding of 400 turns each.The diameter of the solenoid is $1.8 \;cm$ . If the current carried is $8.0\;A$ , estimate the magnitude of B inside the solenoid near its center .

asked Jul 23, 2015 by meena.p

1 answer

Two long and parallel straight wires A and B carrying currents of $8.0\;A$ and $5.0 \;A$ same direction are separated by a distance of $4.0\;cm$ . What is the direction and nature of the force on a 10 cm section of wire A?

asked Jul 23, 2015 by meena.p

1 answer

Two long and parallel straight wires A and B carrying currents of $8.0\;A$ and $5.0 \;A$ same direction are separated by a distance of $4.0\;cm$ . What is the direction of the magnetic field on a 10 cm section of wire A?

asked Jul 23, 2015 by meena.p

1 answer

Two long and parallel straight wires A and B carrying currents of $8.0\;A$ and $5.0 \;A$ same direction are separated by a distance of $4.0\;cm$ . Estimate the force on a $10\;cm$ section of wire A?

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 direction of magnetic force on the wire ?

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

1 answer

What is the direction of the magnetic force per unit length on a wire carrying a current $8\;A$ and making an angle of $30^{\circ}$ with the direction of a uniform magnetic field of $0.15\;T$?

asked Jul 23, 2015 by meena.p

1 answer

What is the magnitude of magnetic force per unit length on a wire carrying a current $8\;A$ and making an angle of $30^{\circ}$ with the direction of a uniform magnetic field of $0.15\;T$?

asked Jul 23, 2015 by meena.p

1 answer

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

asked Jul 22, 2015 by meena.p

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