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Recent questions tagged medium
Questions
A magnetic needle free to rotate in a vertical plane parallel to the magnetic meridian has its north tip pointing down at $22^{\circ}$ with the horizontal. The horizontal component of the earth's magnetic field at the plane is known to be $0.35 \;G$ . Determine the magnetic of the earth's magnetic field at the place.
cbse
class12
physics
ch-5
sec-a
q25
ncert
medium
asked
Jul 13, 2015
by
meena.p
1
answer
A circular coil of 16 turns and radius $10\;cm$ carrying a current of $0.75 \;A$ rests with its plane normal to an external field of magnitude $5.0 \times 10^{-2}\;T$ The coil is free to turn about an axis in its plane perpendicular to the field direction , When the coil is turned slightly and released it oscillates about its stable equilibrium with a frequency of $2.0 m/s$ . What is the moment of inertia of the coil about its axis of rotation ?
cbse
class12
physics
ch-5
sec-a
q24
ncert
medium
asked
Jul 13, 2015
by
meena.p
1
answer
A closely wound solenoid of $2000$ turns and area of cross section $1.6 \times 10^{-4}m^2$, carrying a current of $4.0\;A$ is suspended through its center allowing it to turn in a horizontal plane. What are the force and torque on the solenoid, if a uniform horizontal magnetic field of $7.5 \times 10^{-2}\;T$ is setup at an angle of $30^{\circ}$ with the axis of solenoid ?
cbse
class12
physics
ch-5
sec-a
q23
ncert
medium
asked
Jul 13, 2015
by
meena.p
1
answer
A closely wound solenoid of $2000$ turns and area of cross section $1.6 \times 10^{-4}m^2$, carrying a current of $4.0\;A$ is suspended through its center allowing it to turn in a horizontal plane. What is the magnetic moment associated with the solenoid ?
cbse
class12
physics
ch-5
sec-a
q22
ncert
medium
asked
Jul 10, 2015
by
meena.p
1
answer
A bar magnet of magnetic moment $1.5\;J/T$ lies aligned with the direction of a uniform magnetic field of $0.22\;T$ What is the amount of work required by an external torque to turn the magnet so as to align its magnetic moment, opposite to the field direction ?
cbse
class12
physics
ch-5
sec-a
q21
ncert
medium
asked
Jul 10, 2015
by
meena.p
1
answer
A bar magnet of magnetic moment $1.5\;J/T$ lies aligned with the direction of a uniform magnetic field of $0.22\;T$ What is the torque on the magnet when the magnet aligns normal to the field direction ?
cbse
class12
physics
ch-5
sec-a
q20
ncert
medium
asked
Jul 10, 2015
by
meena.p
1
answer
A bar magnet of magnetic moment $1.5\;J/T$ lies aligned with the direction of a uniform magnetic field of $0.22\;T$ What is the amount of work required by an external torque to turn the magnet so as to align its magnetic moment, opposite to the field direction ?
cbse
class12
physics
ch-5
sec-a
q19
ncert
medium
asked
Jul 10, 2015
by
meena.p
1
answer
A bar magnet of magnetic moment $1.5\;J/T$ lies aligned with the direction of a uniform magnetic field of $0.22\;T$
cbse
class12
physics
ch-5
sec-a
q18
ncert
medium
asked
Jul 10, 2015
by
meena.p
1
answer
If the solenoid in the above question is free to turn about the vertical direction and a uniform magnetic field of $0.25 \;T$ is applied , what is the magnitude of torque on the solenoid when its axis makes an angle of $30^{\circ}$ with the direction of applied field.
cbse
class12
physics
ch-5
sec-a
q17
ncert
medium
asked
Jul 10, 2015
by
meena.p
1
answer
A short bar magnet of magnetic moment $m= 0.32 \;J/T$. is placed in a uniform magnetic field of $0.15 \;T$. If the bar is free to rotate in the plane of the field, Which orientation would correspond to its unstable equilibrium ? What is the potential energy of the magnet?
cbse
class12
physics
ch-5
sec-a
q15
ncert
medium
asked
Jul 10, 2015
by
meena.p
1
answer
A short bar magnet of magnetic moment $m= 0.32 \;J/T$. is placed in a uniform magnetic field of $0.15 \;T$. If the bar is free to rotate in the plane of the field, Which orientation would correspond to its stable equilibrium ? What is the potential energy of the magnet?
cbse
class12
physics
ch-5
sec-a
q14
ncert
medium
asked
Jul 10, 2015
by
meena.p
1
answer
A short bar magnet with its axis at $30^{\circ}$ with a uniform external magnetic field of $0.25\;T$ experiences a forque a magnitude equal to $4.5 \times 10^{-2}\;J$ What is the magnitude of magnetic moment of the magnet?
cbse
class12
physics
ch-5
sec-a
q13
ncert
medium
asked
Jul 10, 2015
by
meena.p
1
answer
The number of electric lines of force radiating from a closed surface vaccum is $1.13 \times 10^{11}$ . The change enclosed by the surface is
cbse
class12
physics
ch-1
sec-a
q98
medium
asked
Jul 8, 2015
by
meena.p
1
answer
Wire is bent in a circle of radius $10\;cm$ It is given a change on it uniformly. What is the electric potential at the center ?
cbse
class12
physics
ch-1
sec-a
q96
medium
asked
Jul 8, 2015
by
meena.p
1
answer
ABC is an equilateral triangle of each side $5 \;cm$ . Two charges of $\pm \large\frac{50}{3}$$\times 10^{-3} \mu c$ are placed at A and B respectively . Calculate the magnitude and direction of resultant intensity at C.
cbse
class12
physics
ch-1
sec-b
q94
medium
asked
Jul 8, 2015
by
meena.p
1
answer
Two batteries of emf $e_1$ and $e_2(e_2 > e_1)$ and internal resistance $r_1$ and $r_2$ respectively are connected in parallel as shown in the figure
cbse
class12
physics
ch-3
sec-a
q93
medium
asked
Jul 7, 2015
by
meena.p
1
answer
The adjacent fig shows a $2.0 \;V$ potentiometer used for the determined of internal resistance of a cell $1.5 \;v$ cell. The balance point of the cell is open circuit is $76.3 \;cm$ . When a resistor of $9.5 \Omega$ is used in the external circuit of the cell, the balance point shifts to $6.48 \;cm$ length of the wire . Determine the internal resistance of the cell
cbse
class12
physics
ch-3
sec-b
q90
medium
asked
Jul 7, 2015
by
meena.p
1
answer
Determine equivalent resistance of network shows in the figure.
cbse
class12
physics
ch-3
sec-b
q88
medium
asked
Jul 7, 2015
by
meena.p
1
answer
Given the resistance of $1\Omega,2 \Omega$ and $3 \Omega$ how will be combine them to get an equivalent resistance of $\large\frac{11}{5}$$\Omega$
cbse
class12
physics
ch-3
sec-a
q85
medium
asked
Jul 6, 2015
by
meena.p
1
answer
Given the resistance of $1\Omega,2 \Omega$ and $3 \Omega$ how will be combine them to get an equivalent resistance of $\large\frac{11}{3}$$\Omega$
cbse
class12
physics
ch-3
sec-b
q84
medium
asked
Jul 6, 2015
by
meena.p
1
answer
Determine the equivalent resistors of the network shown :
cbse
class12
physics
ch-3
sec-b
q7
medium
asked
Jul 6, 2015
by
meena.p
1
answer
An electric kettle has two coils. When one of these is switched on, the water in the kettle boils in 6 minutes. When the other coil is switched on, the water boils in 3 minutes. If the two coils are connected in parallel , find the time taken to boil the water in the kettle .
cbse
class12
physics
ch-3
sec-a
q100
medium
asked
Jul 3, 2015
by
meena.p
1
answer
An electric kettle has two coils. When one of these is switched on, the water in the kettle boils in 6 minutes. When the other coil is switched on, the water boils in 3 minutes. If the two coils are connected in series , find the time taken to boil the water in the kettle .
cbse
class12
physics
ch-3
sec-a
q99
medium
asked
Jul 3, 2015
by
meena.p
1
answer
An immersion heater is rated $836 walt$ In what time it should heat litre of water from $20^{\circ}$ to $40^{\circ}? J= 4.18 \;J/cal $
cbse
class12
physics
ch-3
sec-a
q98
medium
asked
Jul 3, 2015
by
meena.p
1
answer
The earth's surface has a negative surface charge density of $ 10^{-9}cm^{-2}$. The potential difference of $400\;kv$ between the top of the atmosphere and the surface results (due to low conductivity of the lower atmosphere ) in a current of only $1800\;A$ over the entire globe. If their were no mechanism of sustaining atmosphere field, how much time (roughly) would be required to neutralise the the earth's surface ? (This never happen in practice became there is a mechanism to replenish electric charges namely the continual thunder storms and lighting in different parts of the globe) . Radius of the earth $=6.37 \times 10^6m$
cbse
class12
physics
ch-3
sec-a
q97
medium
asked
Jul 3, 2015
by
meena.p
1
answer
A secondary cell after long use has an emt of $1.9\;V$ and a large internal resistance of $ 380 \Omega$ What maximum current can be drawn from the cell ?
cbse
class12
physics
ch-3
sec-a
q70
medium
asked
Jul 1, 2015
by
meena.p
1
answer
Six lead acid type of secondary cells each of emf $2.0V$ and internal resistance $0.015\Omega$ are joined in series to provide a supply to a resistance of $8.5 \Omega$ What are the current drawn from the supply and its terminal voltage ?
cbse
class12
physics
ch-3
sec-b
q69
medium
asked
Jul 1, 2015
by
meena.p
1
answer
A storage battery of emf $8.0 V$ and internal resistance $0.5 \Omega$ is being changed by a $120\;V$ DC supply using a series resistor of $15. 5 \Omega$ What is the terminal voltage of the battery during changing ?
cbse
class12
physics
ch-3
sec-b
q67
medium
asked
Jul 1, 2015
by
meena.p
1
answer
What is the Potential gradient? How is it measured? Explain
cbse
class12
physics
ch-3
sec-b
q61
medium
asked
Jul 1, 2015
by
meena.p
1
answer
Kirchhoff's first law obeys rule of conservation of charge Explain
cbse
class12
physics
ch-3
sec-b
q59
medium
asked
Jun 30, 2015
by
meena.p
1
answer
A heating element using michrome connected to a $230\;V$ supply draws an initial current of $3.2 \;A$ Which settles after a few seconds to a steady value of $2.8 \;A$. What is the steady temperature of the heating element if the room temperature is $27.0^{\circ}$ ? Temperature coefficient of resistance of michrome averaged over the temperature range involved is $1.70 \times 10^{-4 \circ}C^{-1}$
cbse
class12
physics
ch-3
sec-a
q56
medium
asked
Jun 30, 2015
by
meena.p
1
answer
At Room temperature $(27.0^{\circ})$ the resistance of a heating element is $100\;\Omega$ What is the temperature of the element if the resistance is found to be $117\;\Omega$ , given that the temperature coefficient of the material of the resistance is $1.70 \times 10^{-4} .c^{-1}$
cbse
class12
physics
ch-3
sec-a
q55
medium
asked
Jun 30, 2015
by
meena.p
1
answer
A current in a circuit having constant resistance is tripled. How does this affect the power dissipation ?
cbse
class12
physics
ch-3
sec-a
q50
medium
asked
Jun 30, 2015
by
meena.p
1
answer
What are the factor does the potential gradient of the potentiometer wire depend ?
cbse
class12
physics
ch-3
sec-a
q48
medium
asked
Jun 30, 2015
by
meena.p
1
answer
What is potential gradient? State its SI unit
cbse
class12
physics
ch-3
sec-a
q46
medium
asked
Jun 30, 2015
by
meena.p
1
answer
Why is the potential preferred over voltmeter for measuring e.m.f ?
cbse
class12
physics
ch-3
sec-a
q39
medium
asked
Jun 30, 2015
by
meena.p
1
answer
What is the largest voltage you can safely put across a resistor marked $196 \Omega -1W$
cbse
class12
physics
ch-3
sec-a
q36
medium
asked
Jun 30, 2015
by
meena.p
1
answer
Define electrical conductivity of a conductor and give in S.I unit .
cbse
class12
physics
ch-3
sec-a
q34
medium
asked
Jun 30, 2015
by
meena.p
1
answer
Give the relation between drift velocity and electric field
cbse
class12
physics
ch-3
sec-a
q28
medium
asked
Jun 29, 2015
by
meena.p
1
answer
$V-I$ graph for a metallic wire at two different temperatures $T_1$ and $T_2$ are shown in the figure. Which of the two temperature is higher and why ?
cbse
class12
physics
ch-3
sec-a
q27
medium
asked
Jun 29, 2015
by
meena.p
1
answer
Explain why bending a wire does not affect its electrical resistance ?
cbse
class12
physics
ch-3
sec-a
q26
medium
asked
Jun 29, 2015
by
meena.p
2
answers
How will you represent a resistance of $3700 \Omega \pm 10\%$ by colour code?
cbse
class12
physics
ch-3
sec-a
q25
medium
asked
Jun 29, 2015
by
meena.p
1
answer
A carbon resistance is marked in red, green, and orange bands . What is the approximate resistance of the resistor ?
cbse
class12
physics
ch-3
sec-a
q23
medium
asked
Jun 29, 2015
by
meena.p
1
answer
There resistors $1 \Omega, 2 \Omega$ and $3 \Omega$ are combined in series . What is the total resistance of the combination ? b) If the combination is connected to a battery of emf $12\;V$ and negligible internal resistance , Obtain the potential drop across each resistors?
cbse
class12
physics
ch-3
sec-b
q19
medium
asked
Jun 29, 2015
by
meena.p
1
answer
Careful measurement of the electric field at the surface of a black box indicate that net outward flux through the surface of the box is $8.0 \times 10^3 Nm^3 C^{-1}$ If the net outward flux through the surface that there were no changes inside the box. Why or why not ?
cbse
class12
physics
ch-1
q90-b
medium
sec-b
asked
Apr 29, 2015
by
meena.p
1
answer
Careful measurement of the electric field at the surface of a black box indicate that net outward flux through the surface of the box is $8.0 \times 10^3 Nm^3 C^{-1}$What is the net charge inside the box ?
cbse
class12
physics
ch-1
q90-a
medium
sec-b
asked
Apr 29, 2015
by
meena.p
1
answer
When an electric dipole of moment $|P|=q \times 2a$ is held at an angle $\theta$ with the direction of uniform external field E, a torque $T= PE \sin \theta$ acts on the dipole. This torque tries to align the electric dipole in the direction of the field. When P is along E $\theta =0^{\circ} , t= PE \sin 0=zero$ An electric dipole of length 10 cm having a charge $\pm6 \times 10^{-3} \;C$ placed at $30^{\circ}$ with respect to a uniform electric field experiences a torque of magnitude $6 \sqrt 3 N-m$ . Calculate magnitude of electric field.
cbse
class12
physics
ch-1
q88-b
medium
sec-b
asked
Apr 29, 2015
by
meena.p
1
answer
When an electric dipole of moment $|P|=q \times 2a$ is held at an angle $\theta$ with the direction of uniform external field E, a torque $T= PE \sin \theta$ acts on the dipole. This torque tries to align the electric dipole in the direction of the field. When P is along E $\theta =0^{\circ} , t= PE \sin 0=zero$ What is the direction of torque acting on electric dipole held at an angle with uniform electric field?
cbse
class12
physics
ch-1
q88-a
medium
sec-e
asked
Apr 29, 2015
by
meena.p
1
answer
The dimensions of an atom of the order of an angstrom. Thus there must be large electric fields between the protons and electron . Why then is the electrostatic field inside a conductor zero?
cbse
class12
physics
ch-1
q86
medium
sec-b
asked
Apr 29, 2015
by
meena.p
1
answer
An arbitrary surface enclosed a dipole . what is the electric flux through this surface ?
cbse
class12
physics
ch-1
sec-a
q85
medium
asked
Apr 29, 2015
by
meena.p
1
answer
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