Recent questions tagged medium

Find the number of bricks to be laid in a square path of side 25 cm, if the side of each brick is 5 cm.

asked Dec 31, 2015 by pady_1

1 answer

You buy a gallon of lemonade and after drinking it, you have one-fourth left. You take that to a picnic and share it equally with four other people. What fraction of the original lemonade will each person get?

asked Dec 31, 2015 by pady_1

1 answer

Ramakrishnan is reading a novel and this book has 250 pages. Ramakrishnan manages to read $\large\frac{1}{25}$ of the book every day. After 4 days, how many pages does he have left to read?

asked Dec 31, 2015 by pady_1

1 answer

Jack ate $\large\frac{1}{16}$ of a pizza and his friend Jill ate $\large\frac{9}{16}$ of the pizza. How much total pizza did they eat altogether?

asked Dec 31, 2015 by pady_1

1 answer

There are 37 students in class 8. There are 14 girls in the class. What is the fraction of the class that are boys?

asked Dec 31, 2015 by pady_1

1 answer

A change 3 coulomb is moving velocity $\overrightarrow{v}=(4 \hat i +3 \hat j) ms^{-1}$ in a magnetic field $\overrightarrow{B}=(4 \hat i +3 \hat j) wbm^{-2}$Find the force acting on the charge

asked Aug 5, 2015 by meena.p

1 answer

The magnetic field density applied in a cyclotron is $3.5 \;T$ what will be the frequency of electric field that must be applied between the dees in order to accelerate protons. Mass of protons $= 1.67 \times 10^{27}\;kg$

asked Aug 5, 2015 by meena.p

1 answer

The magnetic field density applied in a cyclotron is $3.5 \;T$ what will be the frequency of electric field that must be applied between the dees in order to accelerate protons. Mass of protons $= 1.67 \times 10^{27}\;kg$

asked Aug 5, 2015 by meena.p

1 answer

Magnetic field applied on a cyclotron is $0.7 \;T$ and radius of its dees is $1.8 \;m$ what will be the energy of the emergent protons in $MeV?$

asked Aug 5, 2015 by meena.p

1 answer

A galvanometer with a coil resistance $12 \Omega$ shows a full scale deflection for a current $2.5\;mA$ How will you convert it into a voltmeter of range $7.5 \;V$ Also find the total resistance of Voltmeter formed ?

asked Aug 5, 2015 by meena.p

1 answer

A galvanometer with a coil resistance $12.0 \Omega$ shows a full scale deflection for a current $2.5\;mA$ How it can be converted into an ammeter of range $7.5 \;A$ What will be resistance of ammeter formed ?

asked Aug 4, 2015 by meena.p

1 answer

An electron of energy $2000\;eV$ describes a path in magnetic field of flux density $0.2\;T$ What is the radius of this path ?

asked Aug 4, 2015 by meena.p

1 answer

The ratio of the stunt resistance and the resistance of a galvanometer is $ 1,499$. If the full scale deflection current of the galvanometer is $2 \;mA$ then the range of ammeter is

asked Aug 4, 2015 by meena.p

1 answer

A change q moving along the x- axis with a velocity $\overrightarrow{v}$ is subjected to a uniform magnetic field B acting along the z -axis as it crosses the origin as shown in the figure. (i) Trace the trajectory (ii) Does the change gain kinetic as it enters the magnetic field ?

asked Aug 4, 2015 by meena.p

1 answer

What is the susceptibility and permeability of a perfectly diamagnetic substance ?

asked Aug 4, 2015 by meena.p

1 answer

Five long wires $A,B,C,D$ and $E$ each carrying current I are arranged to form edges of a pentagonal prism as shown in figure. Each carries current out of the plane of paper . What if current in one of the wires (say) A is reversed ?

asked Aug 3, 2015 by meena.p

1 answer

Five long wires $A,B,C,D$ and $E$ each carrying current I are arranged to form edges of a pentagonal prism as shown in figure. Each carries current out of the plane of paper . What will be the field if current in one of the wire (say A) is switched off ?

asked Aug 3, 2015 by meena.p

1 answer

Five long wires $A,B,C,D$ and $E$ each carrying current I are arranged to form edges of a pentagonal prism as shown in figure. Each carries current out of the plane of paper . What will be the magnetic induction at a point on the axis =0 ? Axis is at a distance R from each wire ?

asked Aug 3, 2015 by meena.p

1 answer

A multi range current meter can be constructed by using a galvanometer circuit as shown in figure . We want a current meter that can measure $10\;mA,100\;mA$ and $1\;A$ using a galvanometer of resistance $10 \Omega$ and that produces maximum deflection for current $1\;mA$ Find $S_1,S_2$ and $S_3$ that have to be used

asked Aug 3, 2015 by meena.p

1 answer

A uniform conducting wire of length $12a$ and resistance R is wound up as a current carrying coil in the shape of an equilateral a regular hexagon of side a .The coil is connected to a voltage source of $V_0$ Find the magnetic moment of the coil .

asked Jul 31, 2015 by meena.p

1 answer

A uniform conducting wire of length $12a$ and resistance R is wound up as a current carrying coil in the shape of an equilateral square of side a. the coil is connected to a voltage source of $V_0$ Find the magnetic moment of the coil .

asked Jul 31, 2015 by meena.p

1 answer

A uniform conducting wire of length $12a$ and resistance R is wound up as a current carrying coil in the shape of an equilateral triangle of side a. the coil is connected to a voltage source of $V_0$ Find the magnetic of the coil .

asked Jul 31, 2015 by meena.p

1 answer

Two long wires carrying current $I_1$ and $I_2$ are arranged as shown in figure. the one carrying current $I_1$ is along the x-axis . the other carrying current $I_2$ is along a line parallel to the y-axis , given by $x=0$ and $z=d$ find the force exacted at $O_2$ because of the wire along the x-axis

asked Jul 31, 2015 by meena.p

1 answer

Do magnetic forces obey Newton's third law : Verify for two current elements $\overrightarrow{dl_1}= dl \hat i$ located at the origin and $\overrightarrow{dl_2}= dl \hat j$ located at $(0,R,0). Both carry current I.

asked Jul 30, 2015 by meena.p

1 answer

An electron enters with a velocity $\overrightarrow{v} =v_0 \hat i$ into a cubical region (faces parallel to coordinate plane ) in which there are uniform electric and magnetic fields. The orbit of the electron in front to spiral down inside the cube in plane parallel to the x-y plane . Suggest a configuration of fields $\overrightarrow{E}$ and $\overrightarrow{B}$ that can lead to it.

asked Jul 30, 2015 by meena.p

1 answer

A charged particle of charge e and mass m is moving in an electric field $\overrightarrow{E}$ and magnetic field $\overrightarrow{B}$. Construct dimension less quantities and quantities of dimension $[T]^{-1}$

asked Jul 30, 2015 by meena.p

1 answer

The magnetic force depends on $\overrightarrow{v}$ which depends on the inertial frame of reference . Does then the magnetic force differ from inertia frame to frame ?

asked Jul 30, 2015 by meena.p

1 answer

what will the motion of a charged particle in a cyclotron if the frequency of the radio frequency field is doubled ?

asked Jul 30, 2015 by meena.p

1 answer

A force that does not work must be velocity dependent force. Is this statement true or false

asked Jul 30, 2015 by meena.p

1 answer

Consider a wire carrying a steady current , I placed in a uniform magnetic field $ \overrightarrow B$ perpendicular to its length . Consider the charge inside the wire. It is known that magnetic forces do not work. This implies the

asked Jul 29, 2015 by meena.p

1 answer

A circular loop of magnetic moment M is in an arbitrary orientation in an external magnetic field $\overrightarrow{B}$ . The work done to rotate the loop by $30^{\circ}$about an axis perpendicular to its plane is

asked Jul 29, 2015 by meena.p

1 answer

In a cyclotron, a changed particle

asked Jul 29, 2015 by meena.p

1 answer

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

1 answer

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

1 answer

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

1 answer

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 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

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

1 answer

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