Jharkhand Board Physics Magnetic effect of current MCQs Very Important Verma Guess Paper | Day 2

The distribution of electrons among molecular orbitals is called the electronic configuration of the molecule which provides us the following very important informations about the molecule. (A)Stability of molecule : The molecule is stable if number of bonding moleculer orbital electrons (N_b) is greater than the number of antibonding molecular orbital electrons (N_a) . (B) Bond order : Bond order =1/2(N_b-N_a) A positive bond order means a stable molecule while a negative or zero bond order means an unstable molecule. ( C)Nature of the bond : Bond order 1,2 and 3 corresponds to single , double and triple bonds respectively. (D)Bond length: Bond length decreases as bond order increases. (E)Magnetic nature: Molecular orbitals in a molecule are doubly occupied , the substance is diamagnetic and if one or more molecular orbitals are singly occupied, it is paramagnetic. Which of the following statements is incorrect ?

Statement-1 In the arrangement shown, the hoop carries a constant current. This hoop can remain stationary under the effect of magnetic field of the bar magnet Statement-2 When a magnetic dipole is placed in a non-uniform magnetic field. It experiences a force opposite to direction of external magnetic field at its centre

Two long straight parallel wieres are 2m apart, perpendicular to the plane of the paper. The wire A carries a current of 9.6 A , directed into the plane of the paper. The wire B carries a current such that the magnetic field of induction at the point P , at a distance of 10/11 m from the wire B, is zero. find a. the magnitude and directiion of the current in B. b. the magnitude of the magnetic field of induction of the pont S . c. the force per unit length on the wire B .

Space is divided by the line AD into two regions. Region I is field free and the Region II has a unifrom magnetic field B direction into the plane of the paper. ACD is a simicircular conducting loop of radius r with center at O, hte plane of the loop being in the plane of the paper. The loop is now made to rotate with a constant angular velocity omega about an axis passing through O and the perpendicular to the plane of the paper. The effective resistance of the loop is R. (i) obtain an expression for hte magnitude of the induced cureent in the loop. (ii) Show the direction of the current when the loop is entering into the Rigion II. Plot a graph between the induced e.m.f and the time of roation for two periods or rotation.

Space is divided by the line AD into two regions. Region I is field free and the Region II has a unifrom magnetic field B direction into the plane of the paper. ACD is a simicircular conducting loop of radius r with center at O, hte plane of the loop being in the plane of the paper. The loop is now made to rotate with a constant angular velocity omega about an axis passing through O and the perpendicular to the plane of the paper. The effective resistance of the loop is R. (i) obtain an expression for hte magnitude of the induced cureent in the loop. (ii) Show the direction of the current when the loop is entering into the Rigion II. Plot a graph between the induced e.m.f and the time of roation for two periods or rotation.

Two long parallel wires carry currents in opposite direction as shown. Points A and D lie in the same plane as the wires. The magnetic field at A and D is into the plane of the paper, with intensity B_(A) and B_(D) respectively. If (B_(A))/(B_(D))=7/5 , the value of (I_(1))/(I_(2)) is ____________________.

The elements of group 1 describe, more clearly than any other group of elements, the effects of increasing the size of atoms or ions on the physical and chemical properties.The chemical and physical properties the elements are closely related to their electronic structures and sizes.These metals are highly electropositive and thus form very strong bases, and have quite stable oxo-salts, In the manufacturing of sodium hydroxide chlorine and sodium carbonate, the sodium chloride is used as starting material. Which is not correctly matched ? (1)Basic strength of oxides , Cs_2OltRb_2OltK_2OltNa_2OltLi_2O (2)Stability of peroxides , Na_2O_2 lt K_2O_2 lt Rb_2O_2 lt Cs_2O_2 (3)Stability of bicarbonates , LiHCO_3 lt NaHCO_3 lt KHCO_3 lt RbHCO_3lt CsHCO_3 (4)Melting point , NaF < NaCl < NaBr < Nal