Physics-
General
Easy
Question
A vertical bar magnet is dropped from position on the axis of a fixed metallic coil as shown in fig - I. In fig - II the magnet is fixed and horizontal coil is dropped. The acceleration of the magnet and coil are a1 and a2 respectively then
The correct answer is:
Related Questions to study
physics-
A square coil ABCD is placed in x-y plane with its centre at origin. A long straight wire, passing through origin, carries a current in negative z-direction. Current in this wire increases with time. The induced current in the coil is
A square coil ABCD is placed in x-y plane with its centre at origin. A long straight wire, passing through origin, carries a current in negative z-direction. Current in this wire increases with time. The induced current in the coil is
physics-General
physics-
A wire as a parabola 
is located in a uniform magnetic field of inductance B, the vector B being perpendicular to the plane xy. At the moment t = 0 a connector starts translation wise from the parabola apex with a constant acceleration w to find the emf of electromagnetic induction in the loop this formed as a function of y
A wire as a parabola is located in a uniform magnetic field of inductance B, the vector B being perpendicular to the plane xy. At the moment t = 0 a connector starts translation wise from the parabola apex with a constant acceleration w to find the emf of electromagnetic induction in the loop this formed as a function of y
physics-General
physics-
A rectangular loop with a sliding connector of length 10 cm is situated in uniform magnetic field perpendicular to plane of loop. The magnetic induction is 0.1 tesla and resistance of connector (R) is 1 ohm. The sides AB and CD have resistances 2 ohm and 3 ohm respectively. Find the current in the connector during its motion with constant velocity one metre/sec.
A rectangular loop with a sliding connector of length 10 cm is situated in uniform magnetic field perpendicular to plane of loop. The magnetic induction is 0.1 tesla and resistance of connector (R) is 1 ohm. The sides AB and CD have resistances 2 ohm and 3 ohm respectively. Find the current in the connector during its motion with constant velocity one metre/sec.
physics-General
physics-
A long straight wire is parallel to one edge as in fig. If the current in the long wire is varies in time as 
, what will be the induced emf in the loop?
A long straight wire is parallel to one edge as in fig. If the current in the long wire is varies in time as , what will be the induced emf in the loop?
physics-General
physics-
A square wire loop of 10.0 cm side lies at right angles to a uniform magnetic field of 20T. A 10 V light bulb is in a series with the loop as shown in the fig. The magnetic field is decreasing steadily to zero over a time interval 
t. The bulb will shine with full brightness if t is equal to
A square wire loop of 10.0 cm side lies at right angles to a uniform magnetic field of 20T. A 10 V light bulb is in a series with the loop as shown in the fig. The magnetic field is decreasing steadily to zero over a time interval t. The bulb will shine with full brightness if t is equal to
physics-General
physics-
A wire loop is placed in a region of time varying magnetic field which is oriented orthogonally to the plane of the loop as shown in the figure. The graph shows the magnetic field variation as the function of time. Assume the positive emf is the one which drives a current in the clockwise direction and seen by the observer in the direction of B. Which of the following graphs best represents the induced emf as a function of time.
A wire loop is placed in a region of time varying magnetic field which is oriented orthogonally to the plane of the loop as shown in the figure. The graph shows the magnetic field variation as the function of time. Assume the positive emf is the one which drives a current in the clockwise direction and seen by the observer in the direction of B. Which of the following graphs best represents the induced emf as a function of time.
physics-General
physics-
a conducting loop of radius R is present in a uniform magnetic field B perpendicular the plane of the ring. If radius R varies as a function of time ‘t’, as R = R0+ t. The e.m.f induced in the loop is
a conducting loop of radius R is present in a uniform magnetic field B perpendicular the plane of the ring. If radius R varies as a function of time ‘t’, as R = R0+ t. The e.m.f induced in the loop is
physics-General
physics-
A metal ball of radius R is placed concentrically inside a hollow metal sphere of inner radius 2R and outer radius 3R. The ball is given a charge +2Q and the hollow sphere a total charge – Q. The electrostatic potential energy of this system is :
A metal ball of radius R is placed concentrically inside a hollow metal sphere of inner radius 2R and outer radius 3R. The ball is given a charge +2Q and the hollow sphere a total charge – Q. The electrostatic potential energy of this system is :
physics-General
physics-
A positive charge q is placed in a spherical cavity made in a positively charged sphere. The centres of sphere and cavity are displaced by a small distance 
Force on charge q is
A positive charge q is placed in a spherical cavity made in a positively charged sphere. The centres of sphere and cavity are displaced by a small distance Force on charge q is
physics-General
physics-
Two spherical, nonconducting, and very thin shells of uniformly distributed positive charge Q and radius d are located a distance 10d from each other. A positive point charge q is placed inside one of the shells at a distance d/2 from the center, on the line connecting the centers of the two shells, as shown in the figure. What is the net force on the charge q?
Two spherical, nonconducting, and very thin shells of uniformly distributed positive charge Q and radius d are located a distance 10d from each other. A positive point charge q is placed inside one of the shells at a distance d/2 from the center, on the line connecting the centers of the two shells, as shown in the figure. What is the net force on the charge q?
physics-General
physics-
An infinite, uniformly charged sheet with surface charge density 
cuts through a spherical Gaussian surface of radius R at a distance x from its center, as shown in the figure. The electric flux F through the Gaussian surface is
An infinite, uniformly charged sheet with surface charge density cuts through a spherical Gaussian surface of radius R at a distance x from its center, as shown in the figure. The electric flux F through the Gaussian surface is
physics-General
physics-
Both question (a) and (b) refer to the system of charges as shown in the figure. A spherical shell with an inner radius 'a' and an outer radius 'b' is made of conducting material. A point charge +Q is placed at the centre of the spherical shell and a total charge – q is placed on the shell
Charge – q is distributed on the surfaces as
Both question (a) and (b) refer to the system of charges as shown in the figure. A spherical shell with an inner radius 'a' and an outer radius 'b' is made of conducting material. A point charge +Q is placed at the centre of the spherical shell and a total charge – q is placed on the shell
Charge – q is distributed on the surfaces as
physics-General
physics-
4 charges are placed each at a distance 'a' from origin. The dipole moment of configuration is
4 charges are placed each at a distance 'a' from origin. The dipole moment of configuration is
physics-General
physics-
Two short electric dipoles are placed as shown. The energy of electric interaction between these dipoles will be
Two short electric dipoles are placed as shown. The energy of electric interaction between these dipoles will be
physics-General
physics-
A large sheet carries uniform surface charge density . A rod of length 2l has a linear charge density 
on one half and 
on the second half. The rod is hinged at mid point O and makes an angle 
with the normal to the sheet. The torque experienced by the rod is
A large sheet carries uniform surface charge density . A rod of length 2l has a linear charge density on one half and on the second half. The rod is hinged at mid point O and makes an angle with the normal to the sheet. The torque experienced by the rod is
physics-General
