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Recent questions and answers in Moving charges and magnetism

Questions >> CBSE XII >> Physics >> Moving charges and magnetism

<div>Derive an expression for the torque acting on a current carrying loop suspended in a uniform ma

asked Jul 17, 2017 by pady_1

1 answer

<div>Derive an expression for the force per unit length between two infinitely long straight paralle

answered Jul 17, 2017 by pady_1

1 answer

What is cyclotron? Discuss the principle,construction,theory and working of a cyclotron.What is the

answered Jul 17, 2017 by pady_1

1 answer

What is Lorentz force? Write an expression for it.

asked Jul 17, 2017 by pady_1

1 answer

Apply Ampere's circuital law to find magnetic field inside and outside of a toroidal solenoid. &nbsp

answered Jul 14, 2017 by pady_1

1 answer

What is the magnetic field at the center of the circular current loop?

asked Jul 13, 2017 by pady_1

1 answer

What is the magnetic field due to a long straight current carrying conductor? 

answered Jul 13, 2017 by pady_1

1 answer

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asked Jul 5, 2017 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

answered 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 $= 1.67 \times 10^{27}\;kg$

answered 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 $= 1.67 \times 10^{27}\;kg$

answered 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 $MeV?$

answered 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 ?

answered 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 ?

answered 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 ?

answered Aug 4, 2015 by meena.p

1 answer

A conductor of length $2\;m$ carrying current of $2\;A$ is held parallel to an infinitely long conductor carrying current of $10\;A$ at a distance of $100\;mm$ . Find the force on small conductor .

answered 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

answered 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 ?

answered Aug 4, 2015 by meena.p

1 answer

Why do we prefer the along alnico for making permanent magnets.

answered Aug 4, 2015 by meena.p

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Why do we make use of steel for making permanent magnets.

answered Aug 4, 2015 by meena.p

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Why do use soft iron to make electromagnets?

answered Aug 4, 2015 by meena.p

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

answered Aug 4, 2015 by meena.p

1 answer

What is the relation between relative permeability and susceptibility

answered Aug 4, 2015 by meena.p

1 answer

What is unit of magnetic permeability ?

answered Aug 3, 2015 by meena.p

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

answered Aug 3, 2015 by meena.p

1 answer

Find the magnitude of the magnetic field at the origin O due to a very long conductor carrying current I of the shape .

answered 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 if current in one of the wires (say) A is reversed ?

answered 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 ?

answered 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 ?

answered 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

answered 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 .

answered 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 .

answered 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 .

answered Jul 31, 2015 by meena.p

1 answer

An electron and a positron are released $(0,0,0)$ and $(0,01.5 \;R)$ respectively , in a uniform magnetic field $\overrightarrow{B} =B_0 \hat i$, each with an equal momentum of magnitude $P= eBR$ Under what condition on the direction of momentum will the orbit be non- intersecting circles.

answered Jul 31, 2015 by meena.p

1 answer

A rectangular conducting loop consists of two wires on two opposite sides of length l joined together by rod of length d. The wires are each of the same material but with cross - section differing by a factor of 2. The thicker wire has a resistance R and the rods of low resistance , Which in turn are connected to a constant voltage source $V_0$ the loop is placed in uniform magnetic field B at 45 to its plane . Find the $T$ the torque exerted by the magnetic field on the loop about an axis through the centers of rods.

answered Jul 31, 2015 by meena.p

1 answer

A 100 turn rectangular coil $ABCD$ is hung from one arm of a balance(as shown in the figure) . A mass 500 g is added to the other arm to balance the weight of the coil . A current $4.9\;A$ passes through the coil and a constant magnetic field of $0.2 \;T$ acting inward (in xz plane) is switched on such that only arm CDof length 1 cm lies in the field . Hoe much additional mass 'm' must be added to regain the balance ?

answered Jul 31, 2015 by meena.p

1 answer

A long straight wire carrying current of $25\;A$ rests on a table as shown in the figure. Another wire $PQ$ of length $1\;m$ mass $2.5\;g$ carries the same current but in the opposite direction. the wire $PQ$ is free opposite direction. The wire PQ is free to slide up and down . To what height will PQ rise ?

answered Jul 31, 2015 by meena.p

1 answer

A multi range voltmeter can be constructed by using a galvanometer circuit as shown in the figure. We want to construct a voltmeter that can measure $2V,20V$ and $200\;V$ using a galvanometer of resistance $10\Omega$ and that produces maximum deflection for current of $1mA$ Find $R_1,R_2$ and $R_3$ that have to be used

answered 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

answered 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.

answered 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.

answered Jul 30, 2015 by meena.p

1 answer

A current carrying loop consists of 3 identical quarter circles of radius R, lying in the positive quadrants of $x-y ,y-z$ and $z-x$ planes , with their centers at the origin joined together . Find the direction and magnitude to $\overrightarrow{B}$ at the origin .

answered 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 ?

answered 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 ?

answered 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

answered Jul 30, 2015 by meena.p

1 answer

The cyclotron frequency $W= \large\frac{eB}{m}$ has correct dimension of $[T]^{-1}$. Is this statement true or false

answered Jul 30, 2015 by meena.p

1 answer

A changed partice would continue to move with a constant velocity in a region where in ,

answered Jul 30, 2015 by meena.p

1 answer

A cubical region of space is filled with some uniform electric and magnetic fields . An electron enters the cube magnetic fields. An electron enters the cube across one of its faces with velocity $\overrightarrow {v}$ and a position enters via opposite face with velocity - $\overrightarrow v$ At this instant .

answered Jul 30, 2015 by meena.p

1 answer

Two identical current carrying coaxial loops carry current I in an opposite sense. A simple amperian loop passes through both of them once. Calling the loop as C,

answered 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

answered Jul 29, 2015 by meena.p

1 answer

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