NEET Physics MCQs

A copper wire of radius $0.1 \mathrm{~mm}$ and resistance $2 \, \mathrm{k} \Omega$ is connected across a power supply of 40 V. The number of electrons transferred per second between the supply and the wire at one end is

Two charged spheres of radii $10cm$ and $15cm$ are connected by a thin wire. No charge will flow, if they have

Two charged spheres of radii $10cm$ and $15cm$ are connected by a thin wire. No charge will flow, if they have

A circular ring of diameter ${\rm{20}}\,{\rm{cm}}$ has a resistance of $0.01\,\,{\rm{\Omega }}$. The charge that will flow through the ring if it is turned from a position perpendicular to a uniform magnetic field of ${\rm{2}}.{\rm{0}}\,{\rm{T}}$ to a position to the field is about

A hundred turns of insulated copper wire are wrapped around an iron cylinder of area $1\, imes 1\,{0^{ - 3}}\,{m^2}$ and are connected to a resistor. The total resistance in the circuit is $10\,\,ohms$. If the longitudinal magnetic induction in the iron changes from $1\,\,weber\,\,{m^{ - 2}}$, in one direction to $1\,\,weber\,\,{m^{ - 2}}$ in the opposite direction, how much charge flows through the circuit

In a magnetic field of $0.05\,\,T$, area of a coil changes from $101\,\,c{m^2}$ to $100\,\,c{m^2}$ without changing the resistance which is $2\,\,{\rm{\Omega }}$. The amount of charge that flow during this period is

A coil of $40\,\,{\rm{\Omega }}$ resistance has ${\rm{100}}$ turns and radius $6\,\,mm$ is connected to ammeter of resistance of $160\,\,ohms$. Coil is placed perpendicular to the magnetic field. When coil is taken out of the field, $32\,\,\mu C$ charge flows through it. The intensity of magnetic field will be

A small coil is introduced between the poles of an electromagnet so that its axis coincides with the magnetic field direction. The number of turns is n and the cross sectional area of the coil is $A$. When the coil turns through ${180^0}$ about its diameter, the charge flowing through the coil is $Q$. The total resistance of the circuit is $R$. What is the magnitude of the magnetic induction

Constant current is flowing through a linear conductor of non-uniform area of cross-section. The charge flowing per second through the area of conductor at any cross-section is

A closed coil with a resistance ‘R’ is placed in a magnetic field. The flux linked with the coil is $\phi .$ If the magnetic field is suddenly reversed in direction the charge that flows through the coil will be