NEET UG Moving Charges and Magnetism — practice questions
54 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice NEET UG Moving Charges and Magnetism in the app →A 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:Oersted's 1820 experiment showed that a current-carrying wire produces a noticeable effect on a nearbyThe magnetic force on a charge $q$ moving with velocity $\vec{v}$ in a magnetic field $\vec{B}$ isA positive charge moves with velocity $\vec{v}$ PARALLEL to a uniform magnetic field $\vec{B}$. The magnetic fThe Biot-Savart law gives the magnetic field $d\vec{B}$ due to a small current element $I\,d\vec{l}$ at a poinThe magnetic field at the CENTRE of a circular current loop of radius $R$ carrying current $I$ isInside a long solenoid carrying current $I$ with $n$ turns per unit length, the magnetic field isAmpere's Circuital Law states that around any CLOSED loop, the line integral of $\vec{B}\cdot d\vec{l}$ equalsA charged particle (charge $q$, mass $m$) moves in a circle perpendicular to a uniform magnetic field $B$. TheTwo long parallel wires separated by distance $d$ carry currents $I_1$ and $I_2$ in the SAME direction. The foA current loop of area $A$ carrying current $I$ has a MAGNETIC MOMENT of magnitudeA moving-coil galvanometer measures current by exploiting which physical principle?A charged particle enters a region of crossed electric and magnetic fields ($\vec{E}\perp\vec{B}$). For the paA charged particle of mass $m$ and charge $q$ enters a uniform magnetic field $B$ with velocity $\vec{v}$ at aThe magnetic field at a distance $r$ from a LONG STRAIGHT wire carrying current $I$ isThe magnetic force on a charge q moving with velocity v in magnetic field B is:Magnetic force on a current-carrying conductor of length L in magnetic field B is:A charge q moves perpendicular to a uniform magnetic field B with speed v. The radius of its circular path is:Biot-Savart law for the magnetic field due to a small current element I dL at point r is:The magnetic field at the centre of a circular current loop of radius R carrying current I is:The magnetic field inside a long straight solenoid with n turns per unit length carrying current I is approximTwo long parallel wires carry currents I₁ and I₂ in the SAME direction, separated by distance d. The force perTorque on a magnetic dipole (current loop) of moment m placed in a uniform field B at angle θ is:A cyclotron of magnetic field B accelerates positive charges of mass m, charge q. The cyclotron frequency is:The dimensional formula of the magnetic field B (in SI units of tesla) is:Magnetic field at a point on the axis of a circular loop, far from the loop (distance x ≫ R), behaves as:The work done by a static magnetic force on a moving charge is:A galvanometer is converted into an ammeter of higher range by connecting:An electron and a proton enter a magnetic field with the same kinetic energy, perpendicular to B. The ratio ofThe force on a charge moving in electric and magnetic fields is named after:The magnetic force on a charge depends on its charge, its velocity and the:Compared with a positive charge, the force on a negative charge is:The magnetic force involves which product of velocity and field?To find the force on a current, the rod considered has uniform:With carrier density n, area A and length l, the number of carriers is:All known magnetic fields are due to moving charges and to intrinsic:The law giving the field of a current element is named after Biot and:By the Biot-Savart law, the field of a current element is proportional to the:The Biot-Savart field falls off with distance as its:The Biot-Savart field direction is perpendicular to the plane containing dl and:Ampere's circuital law is an alternative way of expressing the law of:Ampere's circuital law considers a surface that is:Ampere's law is to Biot-Savart law what Gauss's law is to the law of:Ampere's circuital law holds for loops that are:Ampere's law is easiest to apply in situations of high:The two pieces of equipment used to generate magnetic fields are the toroid and the:The machine that combines a solenoid and a toroid for high fields is the:A toroid is a hollow ring wound closely with many:A toroid can be viewed as a solenoid that has been:A galvanometer becomes an ammeter by adding a shunt resistance in:A galvanometer becomes a voltmeter by adding a large resistance in: