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General
Easy
Question
A uniform steel wire hangs from the ceiling and elongates due to its own weight. The ratio of elongation of the upper quarter of the wire to the elongation of the lower quarter of the wire is
The correct answer is:
Related Questions to study
physics-
The conducting connector ab mass m and length L can freely slide on a horizontal long conducting parallel rails connected by capacitor C at one ends (as shown in figure). A non conducting light spring (spring const. K) connected to the connector ab and it is in a relaxed state. The whole system is placed in uniform magnetic field of strength B directed into the plane of rails (as shown in figure) Now at time t = 0, connector is suddenly given a velocity V0 in rightward direction. If resistance and self inductance of circuit is negligible then
The rod will execute (after projecting it at t = 0)
The conducting connector ab mass m and length L can freely slide on a horizontal long conducting parallel rails connected by capacitor C at one ends (as shown in figure). A non conducting light spring (spring const. K) connected to the connector ab and it is in a relaxed state. The whole system is placed in uniform magnetic field of strength B directed into the plane of rails (as shown in figure) Now at time t = 0, connector is suddenly given a velocity V0 in rightward direction. If resistance and self inductance of circuit is negligible then
The rod will execute (after projecting it at t = 0)
physics-General
physics-
The conducting connector ab mass m and length L can freely slide on a horizontal long conducting parallel rails connected by capacitor C at one ends (as shown in figure). A non conducting light spring (spring const. K) connected to the connector ab and it is in a relaxed state. The whole system is placed in uniform magnetic field of strength B directed into the plane of rails (as shown in figure) Now at time t = 0, connector is suddenly given a velocity V0 in rightward direction. If resistance and self inductance of circuit is negligible then
The maximum compression in the spring
The conducting connector ab mass m and length L can freely slide on a horizontal long conducting parallel rails connected by capacitor C at one ends (as shown in figure). A non conducting light spring (spring const. K) connected to the connector ab and it is in a relaxed state. The whole system is placed in uniform magnetic field of strength B directed into the plane of rails (as shown in figure) Now at time t = 0, connector is suddenly given a velocity V0 in rightward direction. If resistance and self inductance of circuit is negligible then
The maximum compression in the spring
physics-General
physics-
The conducting connector ab mass m and length L can freely slide on a horizontal long conducting parallel rails connected by capacitor C at one ends (as shown in figure). A non conducting light spring (spring const. K) connected to the connector ab and it is in a relaxed state. The whole system is placed in uniform magnetic field of strength B directed into the plane of rails (as shown in figure) Now at time t = 0, connector is suddenly given a velocity V0 in rightward direction. If resistance and self inductance of circuit is negligible then
The acceleration of connector as a function of x
The conducting connector ab mass m and length L can freely slide on a horizontal long conducting parallel rails connected by capacitor C at one ends (as shown in figure). A non conducting light spring (spring const. K) connected to the connector ab and it is in a relaxed state. The whole system is placed in uniform magnetic field of strength B directed into the plane of rails (as shown in figure) Now at time t = 0, connector is suddenly given a velocity V0 in rightward direction. If resistance and self inductance of circuit is negligible then
The acceleration of connector as a function of x
physics-General
physics-
In given figure, a wire loop has been bent so that it has three segments: segment ab (a quarter circle), bc (a square corner), and ca (straight). Here are three choices for a magnetic field through the loop:
1) 
2) 
3) 
where is in militias and t is in seconds. If the induced current in the loop due to 
and 
are i1 , i2 and i3 respectively then
In given figure, a wire loop has been bent so that it has three segments: segment ab (a quarter circle), bc (a square corner), and ca (straight). Here are three choices for a magnetic field through the loop:
1)
2)
3)
where is in militias and t is in seconds. If the induced current in the loop due to and are i1 , i2 and i3 respectively then
physics-General
physics-
A flat coil of wire is rotated at a frequency of 10 hertz in the magnetic field produced by three pairs of magnets as shown. The axis of rotation of the coil lies in the plane of the coil and is perpendicular to the field lines. What is the frequency of the alternating voltage in the coil?
A flat coil of wire is rotated at a frequency of 10 hertz in the magnetic field produced by three pairs of magnets as shown. The axis of rotation of the coil lies in the plane of the coil and is perpendicular to the field lines. What is the frequency of the alternating voltage in the coil?
physics-General
physics-
A wire frame as shown in figure is made to rotate about a vertical axis passing through O. There exists a uniform horizontal magnetic field of induction B = 1 Tesla if 
. If the frame rotates (slowly) about 'O' with angular velocity directed along Z-axis having = 4rad/s, the potential difference between Owmagnitude & B is
A wire frame as shown in figure is made to rotate about a vertical axis passing through O. There exists a uniform horizontal magnetic field of induction B = 1 Tesla if . If the frame rotates (slowly) about 'O' with angular velocity directed along Z-axis having = 4rad/s, the potential difference between Owmagnitude & B is
physics-General
physics-
There exists a uniform but time varying magnetic field B = a + bt normal to plane of paper in a cylindrical region as shown. A rectangular conducting loop is placed as shown. Induced emf in branches AB and BC are
There exists a uniform but time varying magnetic field B = a + bt normal to plane of paper in a cylindrical region as shown. A rectangular conducting loop is placed as shown. Induced emf in branches AB and BC are
physics-General
physics-
A uniform but time variant magnetic field, directed out of the plane of paper, is switched on at t = 0 in a . A disc of certain circular region. The magnetic field is increasing at the rate ; dB/dt =
= constant nonconducting material of mass M has a radius R and is free to rotate in the region, about an axis parallel to the magnetic field and passing through the center region of magnetic field. One face of the disc is . The angular velocity of the disc at any times charged uniformly with surface charge (+ve) of density t > 0 is given by
A uniform but time variant magnetic field, directed out of the plane of paper, is switched on at t = 0 in a . A disc of certain circular region. The magnetic field is increasing at the rate ; dB/dt = = constant nonconducting material of mass M has a radius R and is free to rotate in the region, about an axis parallel to the magnetic field and passing through the center region of magnetic field. One face of the disc is . The angular velocity of the disc at any times charged uniformly with surface charge (+ve) of density t > 0 is given by
physics-General
physics-
A (nonrotating) star collapses onto itself from an initial radius Ri with its mass remaining unchanged. Which curve in figure best gives the gravitational acceleration ag on the surface of the star as a function of the radius of the star during the collapse?
A (nonrotating) star collapses onto itself from an initial radius Ri with its mass remaining unchanged. Which curve in figure best gives the gravitational acceleration ag on the surface of the star as a function of the radius of the star during the collapse?
physics-General
physics-
A spherical hole of radius R2 is excavated from the asteroid of mass M as shown in the figure. The gravitational acceleration at a point on the surface of the asteroid just above the excavation is
A spherical hole of radius R2 is excavated from the asteroid of mass M as shown in the figure. The gravitational acceleration at a point on the surface of the asteroid just above the excavation is
physics-General
physics-
A conducting sphere of radius R and a concentric thick spherical shell of inner radius 2R and outer radius 3R is shown in figure. A charge +10Q is given to the shell and inner sphere is earthed. Then charge on inner sphere is
A conducting sphere of radius R and a concentric thick spherical shell of inner radius 2R and outer radius 3R is shown in figure. A charge +10Q is given to the shell and inner sphere is earthed. Then charge on inner sphere is
physics-General
physics-
A charge Q0 is placed at centre of spherical cavity of a conductor and another charge Q, is placed outside the conductor. The correct statement is:
A charge Q0 is placed at centre of spherical cavity of a conductor and another charge Q, is placed outside the conductor. The correct statement is:
physics-General
physics-
Consider the arrangement of two concentric conducting shells with radii a & b respectively as shown in the diagram. The inner shell carries a charge Q. The outer shell is grounded
Consider the arrangement of two concentric conducting shells with radii a & b respectively as shown in the diagram. The inner shell carries a charge Q. The outer shell is grounded
physics-General
physics-
Two concentric shells R and 2R charges qA and qB and potentials 2V and (3/2)V A' respectively. Now shell B is earthed and let charges q B' and q . Then
Two concentric shells R and 2R charges qA and qB and potentials 2V and (3/2)V A' respectively. Now shell B is earthed and let charges q B' and q . Then
physics-General
physics-
On a conductor of nonuniform curvature, the charge
On a conductor of nonuniform curvature, the charge
physics-General
