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A short bar magnet has a magnetic moment of 0.48 J T –1. Give the direction and magnitude of the magnetic field produced by the magnet at a distance of 10 cm from the centre of the magnet on the

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Essential difference between electrostatic shielding by a conducting shell and magnetostatic shielding is due

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A current carrying circular loop of radius R is placed in the x-y plane with centre at the origin. Half of the loop with x > 0 is now bent so that it now lies in the y-z

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

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A multirange voltmeter can be constructed by using a galvanometer circuit as shown in Fig. We want to construct a voltmeter that can measure 2V, 20V and 200V using a galvanometer of resistance 10Ω and that produces maximum deflection for current of 1 mA. Find R1, R2 and R3 that have to be

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A straight wire of length 30 cm and mass 60 milligrawm lies in a direction `30^0` east of north. The earth's magnetic field at this site is horizontal and has a magnitude of 0.8 G. What current must be passed through the wire so that it may float in air ?

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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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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 unlike charges of the same magnitude `Q` are placed at a distance `d`. The intensity of the electric field at the centre of the line joining the two charges,

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Electric flux emanating through a surface element `dS = 5hati` placed in an electric field `E=4hati + 4hatj + 4hatk`

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Assertion: Acceleration of charged particle in non-uniform electric field does not depend on velocity of charged particle. Reason: Charge is an invariant

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Electric Dipole An electric dipole is a pair of point charges with equal magnitude and opposite in sign separated by a very small distance. The mid-point of locations of `-q and q` is called the centre of the dipole. The strength of an electric dipole is measured by a vector quantity known as electric dipole moment `(p)` which is the product of the charge `(q)` and separation between the charges `(2l)`.In most molecules, the centres of positive charges and of negative charges lie at the same place, hence their dipole moment is zero. `e.g. CO_2, CH_4`. However, they develop a

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The electric potential due to point charge `3nC` at distance of 9 cm

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Assertion: When two positive point charges move away from each other, then their electrostatic potential energy decreases. Reason: Change in potential energy between two points is equal to the work done by electrostatic

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Dielectrics Dielectrics are insulating (non-conducting) materials that can produce electric effect without conduction. Movement of free charges is not possible in a dielectric, so they behave differently.When a dielectric material is kept in an electric field, then the external field induces dipole moment. Due to which, net charges on the surface of the dielectric appears.When a dielectric material is kept in an external field, then the induced field will

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Assertion: For a current carrying wire loop of `N` turns, placed in a region of a uniform magnetic field B , the torque acting on it is given by `m xx B`. Reason: Whenever the magnetic moment m is perpendicular to B, then torque on the loop will be

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If the magnet is cut into four equal parts, such that their lengths and breadths are equal, then pole strength of each part

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A current loop behaves as a system of ...................As a result, it acts like an magnetic

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The figure shows certain wire segments joined together to form a co-planar loop. The loop is placed in a perpendicular magnetic field in the direction going into the plane of the figure. The magnitude of the field increases with time and `I_1 & I_2` are the currents in the segment `ab & cd`.

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There are two long co-axial solenoids of same length `l`. The inner & outer coils have radii `r_1 & r_2` and number of turns per unit length `n_1 & n_2`, respectively. The ratio of mutual inductance to the self-inductance of the inner coil

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

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