JEE Main Moving Charges and Magnetism — practice questions
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Oersted's experiment demonstrated that:The magnetic field at a perpendicular distance $r$ from a long straight current-carrying wire of current $I$ iA circular coil of radius $R$ carries current $I$. The magnetic field at the centre of the coil is:Two long, parallel wires carry currents $I_1$ and $I_2$ in the **same direction** separated by distance $d$. TA charged particle moves perpendicular to a uniform magnetic field $B$ with speed $v$. The radius of its circuMagnetic field is measured in:Biot Savart law gives magnetic field due to a current element. It states dB is proportional to:The magnetic force on a charge q moving with velocity v in field B:A current-carrying wire of length L in magnetic field B experiences force:Ampere's law states the line integral of B around a closed loop equals:A magnetic dipole moment of a current loop is:Magnetic field at center of a circular loop of radius R carrying current I:Magnetic field inside a long solenoid (n turns per unit length, current I):Magnetic field at distance r from a long straight current-carrying wire:A charged particle of charge q, mass m enters magnetic field B perpendicular to velocity v. It follows a:Two parallel wires 1 m apart carry currents I1 = 2 A and I2 = 3 A in the SAME direction. Force per unit lengthTorque on a current loop (moment m) in uniform field B:In a velocity selector, electric field E and magnetic field B are perpendicular. Velocity of particles passingMagnetic field on the axis of a circular loop at distance x from center:Magnetic flux through a surface is:A proton (mass m, charge e) enters a uniform magnetic field B perpendicular to its velocity v. Time to completCyclotron frequency for a charged particle in magnetic field B:An electron beam moves with velocity v in a region with E perpendicular to v. To pass undeflected, magnetic fiA solenoid of 200 turns, length 0.5 m, carries 2 A. Find magnetic field inside (μ₀ = 4π × 10⁻⁷):A charged particle moves in a circle of radius 2 cm in a 1 T magnetic field with speed 4 × 10⁶ m/s. Mass-to-chIn a hydrogen atom, the magnetic moment associated with electron orbital motion in ground state is approximateFor a current loop in a non-uniform magnetic field, net force is zero only if:Earth's magnetic field is approximately 50 μT. Force on a 1 m wire carrying 10 A perpendicular to field:A toroid with 1000 turns and average radius 10 cm carries 0.5 A current. Field inside:A solenoid is also called an 'electromagnet'. Why does inserting an iron core greatly increase its magnetic fiTwo parallel wires carrying currents in OPPOSITE directions:A magnetic dipole of moment m in field B has potential energy:In a mass spectrometer, ions of same charge but different mass enter perpendicular to uniform B with same veloA proton moves north at $10^6$ m/s in a magnetic field of $0.1$ T pointing east. The magnetic force on it is:A long straight wire carries $5$ A. The magnetic field $0.10$ m away from the wire is:A solenoid has $500$ turns per metre and carries $2$ A. Field inside is:The cyclotron frequency of a particle of mass $m$ and charge $q$ in field $B$ is: