NEET UG Magnetism & EMI — practice questions
61 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice NEET UG Magnetism & EMI in the app →The Lorentz force on a charge q moving with velocity v in fields E and B is:The force on a charge q moving with speed v perpendicular to a magnetic field B has magnitude:The magnetic force on a stationary charge in a magnetic field is:A charged particle moving in a uniform magnetic field perpendicular to B describes a:The radius of circular motion of a particle of charge q, mass m, speed v in field B (perpendicular) is:The cyclotron frequency (angular) of a charged particle in field B is:In a velocity selector (crossed E and B), a particle passes undeflected if v equals:The Biot–Savart law gives the magnetic field due to an element of current as proportional to:The magnitude of the magnetic field at the centre of a circular current loop of radius R carrying current I isThe magnetic field at a distance r from a long straight current-carrying wire is:Magnetic field inside a long ideal solenoid with n turns per unit length carrying current I is:For a toroid with N total turns, mean radius r, carrying current I, the magnetic field inside is:Ampere's circuital law in integral form states ∮ B · dl equals:The magnetic force per unit length between two parallel wires carrying currents I₁ and I₂ separated by distancTwo parallel wires carrying currents in the same direction:Two parallel wires carrying currents in opposite directions:The magnetic moment of a current loop with area A and current I is:Torque on a magnetic dipole moment m in uniform field B is:Potential energy of a magnetic dipole m in field B is:The SI unit of magnetic field B is:A galvanometer measures small currents using the principle that the torque on a coil in a magnetic field is prA moving coil galvanometer uses a radial magnetic field so that:Magnetic field at the centre of a current-carrying square loop is greater than at the centre of a circular looThe magnetic field along the axis of a long current-carrying wire is:Magnetic monopoles, as isolated magnetic charges, have so far been:The unit of magnetic flux is the:Magnetic field inside an ideal solenoid is:Force on a current-carrying wire of length L placed in field B at angle θ to it is:The unit ratio μ0 ε0 has the same dimensions as:A uniform but time-varying magnetic field $B(t)$ exists in a circular region of radius $a$ and is directed intA wire of length $1\,\mathrm{m}$ is moving at a speed of $2\,\mathrm{ms}^{-1}$ perpendicular to its length andA small square loop of wire of side $l$ is placed inside a large square loop of wire of side $L$ ($L > l$). ThFor a positively charged particle moving in a $x - y$ plane initially along the $x$-axis, there is a sudden chAn infinitely long conductor $PQR$ is bent to form a right angle as shown. A current $I$ flows through $PQR$. A cell is connected between the points $A$ and $C$ of a circular conductor $ABCD$ of centre $O$ with angle $OCTwo straight long conductors $AOB$ and $COD$ are perpendicular to each other and carry currents $i_1$ and $i_2A passenger standing in a bus is thrown backward when the bus suddenly starts moving forward. This is best expOne newton is defined as the force that gives a mass of 1 kg an acceleration of:The linear momentum of a body is defined as the product of its:The impulse of a force has the same dimensions as:The action and reaction forces of Newton's third law:For a given pair of surfaces, the coefficient of kinetic friction is usually:A constant force of 20 N acts on a 5 kg body initially at rest. Its speed after 3 s is:A 0.15 kg ball moving at 12 m s⁻¹ is hit straight back along its path with the same speed. The magnitude of thA 0.04 kg bullet moving at 90 m s⁻¹ is stopped after penetrating 0.6 m into a block. The average resistive forA box rests on the floor of a truck with coefficient of static friction 0.15. The maximum acceleration of the A block just begins to slide down an incline when the angle of inclination is 30°. The coefficient of static fA 0.02 kg bullet is fired with a speed of 300 m s⁻¹ from a 4 kg gun. The recoil speed of the gun is:A 50 kg person stands on a weighing scale inside a lift accelerating upward at 2 m s⁻² (g = 10 m s⁻²). The scaA 0.5 kg stone tied to a string is whirled in a horizontal circle of radius 2 m at a speed of 4 m s⁻¹. The tenThe maximum speed at which a car can round an unbanked circular turn of radius 150 m without skidding is (μs =A 3 kg block hangs from a light string passing over a frictionless pulley and pulls a 20 kg trolley along a hoFor a 3 kg block connected over a frictionless pulley to a 20 kg trolley (μk = 0.04, g = 10 m s⁻²), the tensioA 6 kg mass hangs from a light rope. A horizontal force of 50 N is applied at the rope's midpoint (g = 10 m s⁻One ball strikes a wall normally and rebounds with unchanged speed; an identical ball strikes at 30° to the noA net force F = 6t newton (t in seconds) acts on a 2 kg body initially at rest. The speed of the body at t = 4A block slides down a rough incline of 30° with coefficient of kinetic friction 0.2 (g = 10 m s⁻²). Its acceleA lift descends with a downward acceleration equal to g. The apparent weight of a passenger standing inside isA 10 N horizontal force is applied to a 2 kg block that pushes a 3 kg block in contact with it on a frictionleA 0.2 kg ball strikes the floor vertically at 10 m s⁻¹ and rebounds at 8 m s⁻¹. The magnitude of the impulse iThe optimum (design) speed for a car on a frictionless road banked at 45° along a curve of radius 100 m is (g