Magnetic Effects Of Current And Magnetism Questions

28 Practice QuestionsStart Practicing Now

[Medium]For a short bar magnet, the magnetic field is measured at a point on its axis and at another point on its equatorial line, both at the same distance f...
[Medium]A paramagnetic material is found to have a magnetic susceptibility of $0.0004$ when placed in a magnetizing field. Using the relation between suscepti...
[Hard]A charged particle enters a uniform magnetic field at an angle to the field lines, so its velocity has components both along and across the field. Whi...
[Easy]A single circular loop of radius $3\,\text{cm}$ carries a current, and we compare the magnetic field at its centre with the field at an axial point fa...
[Easy]Materials respond differently to an external magnetic field depending on their atomic structure. Which classification correctly matches a material tha...
[Medium]A toroidal coil has a total of $3000$ turns and a mean radius of $15\,\text{cm}$, carrying a current of $5\,\text{A}$. Using Ampere's circuital law, w...
[Medium]The current sensitivity of a moving coil galvanometer is defined as the deflection produced per unit current. To increase this sensitivity without cha...
[Medium]A rectangular coil of $20$ turns and area $0.05\,\text{m}^2$ carries a current of $4\,\text{A}$ while placed in a uniform magnetic field of $0.3\,\tex...
[Medium]Two long parallel wires separated by $4\,\text{cm}$ carry currents of $5\,\text{A}$ and $10\,\text{A}$ in the same direction. What is the magnitude of...
[Easy]In a cyclotron the frequency at which a positive ion circulates is set by the magnetic field and the ion's charge-to-mass ratio. Which statement corre...
[Easy]A proton enters a uniform magnetic field of $0.2\,\text{T}$ moving perpendicular to the field lines with a speed of $5\times10^{6}\,\text{m s}^{-1}$. ...
[Easy]A long solenoid used in a laboratory has $1000$ turns wound uniformly over a length of $50\,\text{cm}$ and carries a current of $3\,\text{A}$. What is...
[Easy]A long straight power transmission wire carries a steady current of $10\,\text{A}$, and a compass is placed at a perpendicular distance of $5\,\text{c...
[Easy]SI unit of magnetic induction B is:...
[Hard]Torque on magnetic dipole m in uniform field B is:...
[Medium]Diamagnetic materials have susceptibility that is:...
[Hard]Hall voltage arises due to charge separation from:...
[Hard]Energy density in magnetic field B (vacuum) is:...
[Hard]Two long parallel wires distance d carrying currents I in same direction exert force per unit length:...
[Easy]Angle between magnetic field and horizontal is called:...
[Medium]Material with large positive susceptibility strongly magnetized is:...
[Easy]Magnetic dipole moment of current loop is:...
[Easy]According to the Biot-Savart Law, the magnetic field due to a small current element depends on the sine of which angle?...
[Medium]Torque on rectangular coil (N turns, area A) carrying current I in uniform field B (coil plane at angle θ to field) is:...
[Easy]Field inside long ideal solenoid (n turns per length, current I) is:...
[Medium]Cyclotron frequency for charge q, mass m in magnetic field B is:...
[Easy]Magnetic force on charge q moving with velocity v in field B is proportional to:...
[Easy]Line integral of B·dl around closed path equals μ_0 times:...