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In the case of bar magnet, lines of magnetic

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A small bar magnet of moment M is placed in a uniform field of H. If magnet makes an angle of `30^0` with field, the torque acting on the magnet

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The effective length of a magnet is 31.4 cm and its pole strength is 0.5 A.m. The magnetic moment, if it is bent in the form of a semicircle will be ......................Amp.`m^2`

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A bar magnet of length 10 cm and having the pole strength equal `00.1xx10^(-3)` to is kept in a magnetic field having magnetic induction (B) equal to `4pixx10^(-3)` tesla. It makes an angle of `30^0` with the direction of magnefic induction. The value of the torque acting on the magnet is ......................

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A small bar magnet has a magnetic moment 1.2 A.`m^2` . The magnetic field at a distance 0.1 m on its axis will be .........................

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If a plastic rod rubbed with fur is made to touch two small pith balls suspended nearby, then which figure shows their final

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A comb runs through one’s dry hair attracts small bits of paper. This happens

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One metallic sphere A is given positive charge whereas another identical metallic sphere B of exactly same mass as of A is given equal amount of negative charge.

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In nature, the electric charge of any system is always equal

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If the charge on the body is `1 nC`, then how many electrons are present on the

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Charge on a body is `q_1` and it is used to charge another body by induction. Charge on second body is found to be `q_2` after charging,

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Force (F ) between two charges varies with distance (r) between them

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The unit of electrical permittivity

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The force of interaction between two charges `q_1 = 6 muC and q_2= 2 muC` is `12 N`. If charge `q =-2 muC` is added to each of the charges, then the new force of interaction

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A charge `q` is placed at the centre of the line joining two equal charges `Q and Q`. The system of the three charges will be in equilibrium, if `q` is equal

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Two point charges `A and B`, having charges `+Q and -Q` respectively, are placed at certain distance apart and force acting between them is `F` . If 25% charge of A is transferred to B, then force between the charges

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Two particles of equal mass `m` and charge `q` are placed at a distance of 16 cm. They do not experience any force. The value of `q/m`

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Two point charges placed at a certain distance `r` in air exert a force `F` on each other. Then, the distance `r'` at which these charges will exert the same force in a medium of dielectric constant `K` is given

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An object A has a charge of `-2muC` and the object B has a charge of `+6 muC`. Which of the following is

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Electric charges of `1muC, - 1muC and 2muC` are placed in air at the corners A, B and C respectively of an equilateral triangle ABC having length of each side 10 cm. The resultant force on the charge at C

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