A thin diamagnetic rod is placed vertically between the poles of an electromagnet . When the current in the electromagnet is switched on , then the diamagnetic rod is pushed up , out of the horizontal magnetic field . Hence the rod gains gravitational potential energy . The work required to do this comes from
A thin diamagnetic rod is placed vertically between the poles of an electromagnet . When the current in the electromagnet is switched on , then the diamagnetic rod is pushed up , out of the horizontal magnetic field . Hence the rod gains gravitational potential energy . The work required to do this comes from
A
the lattice structure of the material of the rod
B
the magnetic field
C
the current source
D
the induced electric field due to the changing magnetic field .
Text Solution
Verified by Experts
The correct Answer is:
C
The the new coil , diameter becomes 2d , I e . The electric source has converted into stored gravitational potential energy in the rod .
Topper's Solved these Questions
Magnetic Properties of Materials
CHHAYA PUBLICATION|Exercise CBSE SCANNER|11 VideosMagnetic Properties of Materials
CHHAYA PUBLICATION|Exercise EXAMINTION ARCHIVE (AIPMT)|1 VideosLIGHT WAVE AND INTERFERENCE OF LIGHT
CHHAYA PUBLICATION|Exercise CBSE SCANNER|15 VideosOPTICAL INSTRUMENTS
CHHAYA PUBLICATION|Exercise CBSE SCANNER|8 Videos
Similar Questions
Explore conceptually related problems
A metal rod PQ is resting on the rails A'B' and positioned between the poles of a permanent magnet. The rails, the rod and the magnetic field are in three mutually perpendicular directions. A galvanometer G connects the rails through a switch K. Length of the rod = 15 cm, B = 0.50 T, resistance of the closed loop containing the rod = 9.0 mOmega . Assume the field to be uniform. Is there an excess charge built up at the ends of the rods when K is open? What if K is closed?
A metal rod PQ is resting on the rails A'B' and positioned between the poles of a permanent magnet. The rails, the rod and the magnetic field are in three mutually perpendicular directions. A galvanometer G connects the rails through a switch K. Length of the rod = 15 cm, B = 0.50 T, resistance of the closed loop containing the rod = 9.0 mOmega . Assume the field to be uniform. With K open and the rod moving uniformly, there is no net force on the electrons in thr rod PQ even though they do experience magnetic force due to the motion of the rod. Explain.
A metal rod PQ is resting on the rails A'B' and positioned between the poles of a permanent magnet. The rails, the rod and the magnetic field are in three mutually perpendicular directions. A galvanometer G connects the rails through a switch K. Length of the rod = 15 cm, B = 0.50 T, resistance of the closed loop containing the rod = 9.0 mOmega . Assume the field to be uniform. How much power is required by an external agent to keep the rod moving at the same speed (=12cm.s^(-1)) when K is closed? How much power is required when K is open?
The french physicist Louis de Broglie in 1924 postulated that matter like radiation show a dual behaviour . He proposed the following relationship between the wavelength lambda of a material particle its linear momentum p and planck constant h lamda=h/p =h/(mv) The de broglie relation implies that the wavelength of a particle should decreases as its velocity increases . it also implies that for a given velocity heavier particles should have shorter wavelength than lighter particles. The waves associated with particles in motion are called matter waves or de broglie waves. These waves differ from the electromagnetic waves as they (i) have lower velocities (ii) have no electrical and magnetic fields and (iii) are not emitted by the particle under consideration . The experimental confirmation of the de-broglie relation was obtained when Davisson ans Germer in 1927 observed that a beam of electrons is diffracted by a nickel crystal . as diffraction a characteristics property of waves hence the beam of electron behaves as a wave, as proposed by de-broglie. If proton, electron and alpha -particle are moving with same kinetic energy then the order of de-Broglie's wavelength
On a smooth plane inclined at 30^(@) with the horizontal, a thin current carrying metallic rod is placed parallel to the horizontal ground. The plane is in a uniform magnetic field of 0.15T alon the vertical direction. For what value of current can the rod remain stationary ? the mass per unit lenght of the rod is 0.30 kg/m.
A pair of parallel horizontal conducting rails of negligible resistance shorted at one end is fixed on a table. The distance between the rails is L.A conducting massless rod of resistance R can slide on the rails frictionlessly. The rod is tied to a massless string which passes over a pulley fixed to the edge of the table. A mass m, tied to the other end of the string, hangs vertically. A constant magnetic field B exists perpendicular to the table. If the system is released from rest. Calculate (a) the terminal velocity achieed by the rod and (b) the acceleration of the mass at the instant, when the velocity of the rod is half the terminal velocity.
A straight horizontal conducrting rod of length 0.45m and mass 60g is suspended by two vertical wires at its ends. A current of 5.0A is set up in the rod through the wires. What will be the total tension in the wires the direction of current is reversed keeping the magnetic field the same as before ? (Ignor the mass of th wires g=9.8 m*s^(-2) .
A straight horizontal conducrting rod of length 0.45m and mass 60g is suspended by two vertical wires at its ends. A current of 5.0A is set up in the rod through the wires. What magnetic field should be set up nromal to the conductor in order that the tension in the wires is zero ?
A metallic rod of mass per unit length 0.5kg m^(-1) is lying horizontally on a smooth inclined plane which makes an angle fo 30^(@) with the horizontal. The rod is not allowed to slide down fly flowing a current through it when a magnetic field of induction 0.25T is acting on it is the vertical direction. The current flowing in the rod to keep it stationary is