Recent questions in Physics

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

1 answer

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

1 answer

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

1 answer

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

1 answer

A long straight wire carries a current of $35\;A$ what is the direction of the magnetic field?

asked Jul 22, 2015 by meena.p

1 answer

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 direction of the magnetic field B at the center of the coil ?

asked Jul 22, 2015 by meena.p

1 answer

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

1 answer

For a para magnetic substance

asked Jul 22, 2015 by meena.p

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The magnetic susceptibility of a super conductor is __________

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

1 answer

Iso gonic lines are the lines joining places of ____________

asked Jul 22, 2015 by meena.p

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The small angle between magnetic axis and geographic axis at a place is called _________ at that place .

asked Jul 22, 2015 by meena.p

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The value of H on the surface of earth is of the order of ___________

asked Jul 22, 2015 by meena.p

1 answer

A freely suspended magnet at equator will set itself _________ to the surface of earth

asked Jul 22, 2015 by meena.p

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If $\lambda$ is the magnetic latitude at a place, then what is the relation between the angle of dip and $\lambda$ magnetic latitude .

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

1 answer

In a tangent galvanometer , When a current of $10\;mA$ is passed the deflection is $31^{\circ}$ By what percentage , the current has to be increased , so as to produce a deflection of $42^{\circ}$ ?

asked Jul 22, 2015 by meena.p

1 answer

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

1 answer

Two identical thin bar magnets, each of length L and pole strength m are placed at right angles to each other, with the north pole of one touching the south pole of the other . Find the magnetic moment of the system.

asked Jul 21, 2015 by meena.p

1 answer

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

1 answer

A compass needle whose magnetic moment is $60Am^2$ pointing geographic north at a certain place, Where the horizontal component of earth's magnetic field is $40 \mu wbm^{-2}$ experiences a torque $1.2 \times 10^{-3}\;Nm$ What is the declination of the place?

asked Jul 21, 2015 by meena.p

1 answer

The declination at a place is $20^{\circ}$ west. In what direction should a ship be stressed so that it reaches geographic north east ?

asked Jul 21, 2015 by meena.p

1 answer

What is the approximate distance upto which earth's magnetic field extends?

asked Jul 21, 2015 by meena.p

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A magnetic dipole is situated in the direction of a magnetic field . What is its potential energy ?

asked Jul 21, 2015 by meena.p

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Give two examples of magnetic dipole

asked Jul 21, 2015 by meena.p

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Why do magnetic lines of force prefer to pass through ferromagnetic substance than through air ?

asked Jul 21, 2015 by meena.p

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Name the material used in making the core of moving coil galvanometer .

asked Jul 21, 2015 by meena.p

1 answer

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

1 answer

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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