[{"id":156307,"question":"When the charged particle is projected at right angles to the field, then experienced by it will be:","choices":[{"text":"Maximum","value":"A"},{"text":"Zero","value":"B"},{"text":"qvB","value":"C"},{"text":"Both (A) and (B)","value":"D"},{"text":"Both (A) and (C)","value":"E"}],"correctAnswer":5},{"id":156306,"question":"A long wire wound tightly on a cylindrical core is called:","choices":[{"text":"Potentiometer","value":"A"},{"text":"Solenoid","value":"B"},{"text":"Toroid","value":"C"},{"text":"Wheat and stone bridge","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":2},{"id":156305,"question":"Magnetic flux passing through the an element of are A placed perpendicular to a uniform magnetic field Bis:","choices":[{"text":"Maximum","value":"A"},{"text":"Minimum","value":"B"},{"text":"Zero","value":"C"},{"text":"Very small","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":1},{"id":156304,"question":"Magnetic flux passing through a element whose vector area makes an angle0º with lines of magnetic force is:
","choices":[{"text":"BACosѲ
","value":"A"},{"text":"Zero","value":"B"},{"text":"BA","value":"C"},{"text":"BA sinѲ","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":3},{"id":156303,"question":"At a given instant, a photon moves in +x direction in a region where there magnetic field in -z direction. The magnetic force on the proton will be the:","choices":[{"text":"-y direction","value":"A"},{"text":"+y direction","value":"B"},{"text":"+z direction","value":"C"},{"text":"-z direction","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":2},{"id":156302,"question":"NmA-1 is commonly called:","choices":[{"text":"Weber","value":"A"},{"text":"Apmere","value":"B"},{"text":"Guass","value":"C"},{"text":"Coulomb","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":1},{"id":156301,"question":"Strength of magnetic field is measured in SI units, in:","choices":[{"text":"N","value":"A"},{"text":"N/Am","value":"B"},{"text":"Am/N","value":"C"},{"text":"Nm/A","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":2},{"id":156300,"question":"The permeability of free space is measured in:","choices":[{"text":"Wb/Am","value":"A"},{"text":"Wb A/m","value":"B"},{"text":"Am/Wb","value":"C"},{"text":"m/Web A","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":1},{"id":156299,"question":"If the number of turns of a solenoid (carrying a steady current I) is doubled without changing the length of a solenoid, then magnetic field:","choices":[{"text":"Becomes Half","value":"A"},{"text":"Becomes double","value":"B"},{"text":"Is not affected","value":"C"},{"text":"Becomes one fourth","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":2},{"id":156298,"question":"The magnetic field inside a solenoid can be increased by:","choices":[{"text":"Increasing n","value":"A"},{"text":"Decreasing I","value":"B"},{"text":"Increasing I","value":"C"},{"text":"By using iron core within solenoid","value":"D"},{"text":"All correct except (B)","value":"E"}],"correctAnswer":5},{"id":156297,"question":"Total number of turns on 0.15 m length solenoid is 300. the value of n is:","choices":[{"text":"Greater than 300","value":"A"},{"text":"Smaller than 300","value":"B"},{"text":"Equal to 300","value":"C"},{"text":"Any of (A) or (B)","value":"D"},{"text":"Any of (A) or(C)","value":"E"}],"correctAnswer":1},{"id":156296,"question":"Hold the solenoid in the right hand with fingers\r\ncurling in the direction of current. The direction of the field will be given\r\nby:","choices":[{"text":"Thumb
","value":"A"},{"text":"Curled fingers
","value":"B"},{"text":"Middle finger
","value":"C"},{"text":"Arm of right hand
","value":"D"},{"text":"None of these
","value":"E"}],"correctAnswer":1},{"id":156294,"question":"In the formula B= µ̻ nl, the symbol n denotes:","choices":[{"text":"Total number of turns\r\nof solenoid
","value":"A"},{"text":"Number\r\nof turns per unit length
","value":"B"},{"text":"Number of turns per\r\nunit volume
","value":"C"},{"text":"Numbers of turns per\r\nunit area
","value":"D"},{"text":"Number of moles
","value":"E"}],"correctAnswer":2},{"id":156292,"question":"A field is uniform and much stronger:","choices":[{"text":"Inside\r\na long solenoid
","value":"A"},{"text":"Outside a long solenoid
","value":"B"},{"text":"At the end of a long\r\nsolenoid
","value":"C"},{"text":"At the central point of\r\nlong solenoid
","value":"D"},{"text":"None of these
","value":"E"}],"correctAnswer":1},{"id":156291,"question":"A solenoid is a coil of wire which is:","choices":[{"text":"Short, loosely wound, cylindrical
","value":"A"},{"text":"Long, tightly wound,\r\nspherical
","value":"B"},{"text":"Long, loosely wound,\r\ncylindrical
","value":"C"},{"text":"Long,\r\ntightly wound, cylindrical
","value":"D"},{"text":"None of these
","value":"E"}],"correctAnswer":4}]