Moving Charges and Magnetism - Rajasthan Board (RBSE) STD 12 Science Physics Questions

Q 1M.C.Q (1 Marks)1 Mark

When a charged particles moves in a uniform magnetic field in a direction perpendicular to the field, then the path of the particle will be:

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Q 2M.C.Q (1 Marks)1 Mark

Moving charge produces:

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Q 3M.C.Q (1 Marks)1 Mark

The toroid of radius 10 cm has 100 turns. If a current of 0.1 ampere is flowing in it, then the value of the magnetic field on the axis of the toroid will be:

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Q 4M.C.Q (1 Marks)1 Mark

A constant current is flowing through a long straight conductor, then the graph showing change in produced magnetic field B with distance r is:

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Q 5M.C.Q (1 Marks)1 Mark

Due to a current carrying circular coil of radius $R$, intensity of magnetic field on its axis at a distance $x(x \gg R )$, B will depend on $x$ :

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Q 61 Marks Question1 Mark

How can a galvanometer be converted into a voltmeter?

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Q 71 Marks Question1 Mark

The ratio between flux binding and current I passing through a coil of N turns is called $\left(\frac{ N \phi}{2}\right)$

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Q 81 Marks Question1 Mark

Write expression in vector form for produced magnetic field due to small part of a current carrying conductor in Biot$-$Savart law.

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Q 91 Marks Question1 Mark

Show that no work is done by magnetic Lorentz force on a moving charged particle in magnetic field.

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Q 101 Marks Question1 Mark

A ring is uniformly charged. The total charge on ring is q and its radius is r. If it rotates on its axis by n rounds per second then what is the magnitude of produced magnetic field at the center?

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Q 112 Marks Questions2 Marks

Draw a diagram of magnetic field lines due to any current carrying circular loop.

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Q 122 Marks Questions2 Marks

A coil of N turns is wound tightly in the form of a spiral whose internal and external radii $r_1$ are $r_2$ and respectively. Current $I$ is flowing through the coil, then calculate the magnetic field at the center.

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Q 132 Marks Questions2 Marks

Two identical coils, radius of each is 8 cm and number of turns is 100 are coaxial and their centers are 12 cm apart. If current of 1 A flows in each coil in the same direction, then calculate the magnetic field at the midpoint on the axial line.

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Q 142 Marks Questions2 Marks

Write an expression $F$ in vector form for a charge $q$ moving with a velocity $\vec{v}$ in a magnetic field $\vec{B}$. Obtain conditions with the help of this expression when this force is (i) maximum and (ii) minimum.

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Q 152 Marks Questions2 Marks

An electron is not deflected while passing through any field. Is it possible that there is no magnetic field present at that place? Explain.

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Q 163 Marks Question3 Marks

"Write ampere's circuital law. In a long straight wire of cross-sectional cut (radius a), a direct current is flowing in the wire. Current is uniformly distributed in the wire. Calculate the magnetic field in inner surface of the wire ( $r

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Q 173 Marks Question3 Marks

An alpha particle enters a magnetic field of 0.2 weber $/ m ^2$ with a speed of $6.0 \times 10^5 m / s$ perpendicular to the field. Find out the acceleration of the particle and radius of the path.

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Q 183 Marks Question3 Marks

Write Biot-Savart law. Write the path of the motion of an electron when it enters magnetic field (a) perpendicularly (b) at $\theta$ angle.

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Q 193 Marks Question3 Marks

Current of 4 A is flowing in a straight wire AB. A proton $P$ is travelling parallel to the wire in the opposite direction of current with a speed of $4 \times 10^6$ $m / s$ at a distance of 0.2 m from the wire as shown in the diagram. Calculate the magnitude of force applied on the proton and also tells its direction.

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Q 203 Marks Question3 Marks

Two long parallel wires are 8 cm apart. Currents of magnitudes $i$ and $3 i$ are flowing in them respectively in the same direction. Where the resultant magnetic field due to two will be zero?

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Q 214 Marks Questions4 Marks

Derive an expression for the magnetic field at any point on the axis of a current carrying loop from Bio-Savart's law. Draw the necessry fig.

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Q 224 Marks Questions4 Marks

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

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Q 234 Marks Questions4 Marks

(a) 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 make an angle of $60^{\circ}$ with the normal of the coil. Calculate the magnitude of the counter torque that must be applied to prevent the coil from turning.
(b) Would your answer change, if the circular coil in (a) were replaced by a planar coil of some irregular shape that encloses the same area? (All other particulars are also unaltered.)

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Q 244 Marks Questions4 Marks

In a chamber, a uniform magnetic field of 6.5 G (1 G = 10^-4T ) is maintained. An electron is shot into the field with a speed of 4.8 X 10⁶m s^-1normal to the field. Explain why the path of the electron is a circle. Determine the radius of the circular orbit.
$\left( e =1.6 \times 10^{-19} C , m_e=9.1 \times 10^{-31} kg\right)$

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Q 255 Marks Questions5 Marks

Obtain expression for force on unit length of two straight parallel current carrying conductors. Under what conditions is this force attractive or repulsive? Define the standard unit of electric current.

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Q 265 Marks Questions5 Marks

Examine the maximum value of magnetic field at a point on the axis of circular current carrying coil after obtaining an expression for it.###Calculate produced magnetic field on the axis of any current carrying circular coil by making diagram. Examine the graph between distance and change in magnetic field after drawing the graph.

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Q 275 Marks Questions5 Marks

State Biot-Savart statement. Obtain an expression for produced magnetic field due to a straight and limited length of current carrying conductor wire. Write its similarities and differences with coulomb's law of electrostatics.

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Q 285 Marks Questions5 Marks

What do you understand by sensitivity and efficiency of a galvanometer? On which factors does it depend?

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Q 295 Marks Questions5 Marks

What is a moving coil galvanometer? Write its working by drawing its diagram and its principle. Prove that current in it is proportional to the produced deflection.###What is a galvanometer? Explain construction, working and principle of a moving coil galvanometer.

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Q 30Fill in the blanks.1 Mark

When electric current flows in the same direction in two parallel electricity conducting wires, they experience __________ force between them.

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Q 31Fill in the blanks.1 Mark

If magnetic field doing work on a charged particle is perpendicular to the velocity of the particle, then there no __________ on moving charged particle.

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Q 32Fill in the blanks.1 Mark

Unit of magnetic permeability of vacuum is ___________.

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Q 33Fill in the blanks.1 Mark

By Fleming's left hand rule, direction of __________ acting on current carrying wire can be determined.

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Q 34Fill in the blanks.1 Mark

A charge at rest in a magnetic field does not experience ___________.

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