[{"id":253275,"question":"The magnetic field due to the electric current in a conducting wire is:","choices":[{"text":"Towards the centre of the conducting wire","value":"A"},{"text":"Circular around the conducting wire","value":"B"},{"text":"In the direction of the electric current","value":"C"},{"text":"In the direction opposite to the electric current","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":253274,"question":"The magnetic field of a solenoid is quite similar to that of a:","choices":[{"text":"Straight conductor","value":"A"},{"text":"A horse shoe magne","value":"B"},{"text":"Any magnet","value":"C"},{"text":"A bar magnet","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":253269,"question":"The magnetic field produced due to the current in a straight wire is proportionalto the :","choices":[{"text":"Electric current","value":"A"},{"text":"Conducting material","value":"B"},{"text":"Length of the wire","value":"C"},{"text":"Diameter of the wire","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":253262,"question":"If an electron vertically downwards, then the horizontal component of the earth’s\r\nmagnetic field will deflect it to wards","choices":[{"text":"West","value":"A"},{"text":"East","value":"B"},{"text":"North","value":"C"},{"text":"North","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":253260,"question":"A tritium and alpha particle enter the magnetic field with same kinetic energy, what will\r\nbe the ratio of their radii?","choices":[{"text":"3:4","value":"A"},{"text":"√3: 1","value":"B"},{"text":"√3: 4","value":"C"},{"text":"√3:√2","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":253256,"question":"An electron and a proton are projected at right angles to a uniform magnetic field with","choices":[{"text":"the electron trajectory will be less curved than proton’s trajectory","value":"A"},{"text":"the electron trajectory will be more curved than proton’s trajectory","value":"B"},{"text":") both trajectories will be equally curved","value":"C"},{"text":") both particles continue to move along a straight lins","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":253252,"question":"The direction of force experienced by a moving in a magnetic field will be:","choices":[{"text":"Parallel to the field","value":"A"},{"text":"Opposite to the field","value":"B"},{"text":"Parallel to its direction of motion","value":"C"},{"text":"Perpendicular to both the field and the velocity vector","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":253250,"question":"Charge to mass ratio (e/m) of a charge particle is also called its:","choices":[{"text":"Specific charge","value":"A"},{"text":"Specific Force","value":"B"},{"text":"Gyro-magnetic ratio","value":"C"},{"text":"Magneto-mechanical ratio","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":253247,"question":"A positively charged particle is moving perpendicular to a uniform magnetic field. The\r\nmagnetic force makes the particle to move along:","choices":[{"text":"An elliptical path","value":"A"},{"text":"A circular path","value":"B"},{"text":"A parabolic path","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":253242,"question":"Which one of the following particles projected perpendicular to a uniform magnetic field\r\nwith the same velocity will be deflected least?","choices":[{"text":"Electron","value":"A"},{"text":"Proton","value":"B"},{"text":"Deuton","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":253240,"question":"A magnetic field","choices":[{"text":"Always exerts a force on a charged particle","value":"A"},{"text":"Never exerts a force on a charged particle","value":"B"},{"text":"Exerts a force on a charged particle if it is moving across the magnetic lines of force","value":"C"},{"text":"Exerts a force on a charged particle if it is moving along the magnetic lines of force.","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":253237,"question":"A straight current carrying conductor experiences maximum forces in a uniform\r\nmagnetic field when it is placed:","choices":[{"text":"Parallel to the field","value":"A"},{"text":"Perpendicular o the field","value":"B"},{"text":"At an angle of 45 to the field","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":253234,"question":"A long solenoid has 20 turns/ cm. The current necessary to produce a magnetic field of\r\n20 mellites inside the solenoid is approximately:","choices":[{"text":"1A","value":"A"},{"text":"2A","value":"B"},{"text":"4A","value":"C"},{"text":"8A","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":253233,"question":"Magnetic field inside a solenoid is:","choices":[{"text":") Directly proportional to current","value":"A"},{"text":"Inversely proportional to current","value":"B"},{"text":"Directly proportional to its length","value":"C"},{"text":"Inversely proportional to total no of turns","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":253231,"question":"A source of a magnetic field is:","choices":[{"text":"An isolated magnetic","value":"A"},{"text":"A static electric charge","value":"B"},{"text":"A moving electric charge","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3}]