Physics-
General
Easy
Question
A small coil of ‘N’ turns has an area “A” and a current “I” flows through it The magnetic dipole moment of this coil will be ...
- NI
- NIA
The correct answer is: NIA
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A conductor AB of length “ 
” carrying current “i ” is placed perpendicular to a long straight conductor XY carrying a current i as shown in the fig The force on AB will act ........
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An electron is accelerated through a potential difference of 100 volt and then enters a region where it is moving perpendicular to a magnetic field B T = 0.2 The radius of the circular path is cm
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The magnitude of the force depends upon the ....
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A particle of charge Q and mass M moves in a circular path of radius R in a uniform magnetic field of magnitude B. The same particle now moves with the same speed in a circular path of same radius R in the space between the cylindrical electrodes of the cylindrical capacitor. The radius of the inner electrode is R/2 while that of the outer electrode is 3R/2. Then the potential difference between the capacitor electrodes must be
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A particle of specific charge (charge/mass) a starts moving from the origin under the action of an electric field 
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OABC is a current carrying square loop an electron is projected from the centre of loop along its diagonal AC as shown. Unit vector in the direction of initial acceleration will be
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A mass spectrometer is a device which select particle of equal mass. An iron with electric charge q > 0 and mass m starts at rest from a source S and is accelerated through a potential difference V. It passes through a hole into a region of constant magnetic field 
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A charged particle moves in a magnetic field 
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An electron having kinetic energy T is moving in a circular orbit of radius R perpendicular to a uniform magnetic induction If kinetic energy is doubled and magnetic induction tripled, the radius will become
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Two long conductors are arranged as shown above to form overlapping cylinders, each of raidus r, whose centers are separated by a distance d. Current of density J flows into the plane of the page along the shaded part of one conductor and an equal current flows out of the plane of the page along the shaded portion of the other, as shown. What are the magnitude and direction of the magnetic field at point A?
Two long conductors are arranged as shown above to form overlapping cylinders, each of raidus r, whose centers are separated by a distance d. Current of density J flows into the plane of the page along the shaded part of one conductor and an equal current flows out of the plane of the page along the shaded portion of the other, as shown. What are the magnitude and direction of the magnetic field at point A?
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A long straight metal rod has a very long hole of radius ‘a’ drilled parallel to the rod axis as shown in the figure. If the rod carries a current ‘i’ find the value of magnetic induction on the axis of the hole, where OC = c
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