[{"id":111207,"question":"When an electron enters in a magnetic field right angle to its motion, the magnitude of its velocity will be","choices":[{"text":"changed","value":"A"},{"text":"zero","value":"B"},{"text":"unchanged","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111206,"question":"In the expression of force experienced by electron, the direction of both <u>v</u> and <u>B</u> are","choices":[{"text":"parallel","value":"A"},{"text":"zero","value":"B"},{"text":"perpendicular","value":"C"},{"text":"none of them","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111205,"question":"If volume of wire is 'AL' and there are 'n' numbers of charge carriers per unit volume, then the total number of charge carriers are","choices":[{"text":"n/AL","value":"A"},{"text":"Al/n","value":"B"},{"text":"nAL","value":"C"},{"text":"nA/L","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111204,"question":"Lorentz force is defined as","choices":[{"text":"q(E + V x B)","value":"A"},{"text":"q(E x B + V)","value":"B"},{"text":"q(E x V + B)","value":"C"},{"text":"q(E x B)","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111203,"question":"The force experienced by charged particle is maximum, if it moves","choices":[{"text":"parallel to magnetic field","value":"A"},{"text":"perpendicular to magnetic field","value":"B"},{"text":"opposite to the magnetic field","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111202,"question":"41 The force experience, when proton projected in a magnetic field with velocity 'v' is","choices":[{"text":"+e(v x B)","value":"A"},{"text":"-C(V x B)","value":"B"},{"text":"+e<sup>2</sup>(v x B)","value":"C"},{"text":"-e(v<sup>2</sup>x B)","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111201,"question":"The force experienced by an electron projected in a magnetic field B with a velocity V is given by","choices":[{"text":"F=e(V x B)","value":"A"},{"text":"F= -e(V x B)","value":"B"},{"text":"F= e(B x V)","value":"C"},{"text":"Both a and c","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111200,"question":"The force experienced by a single charge carrier moving with velocity 'v' i magnetic field of strength 'B' is given by","choices":[{"text":"F =q(v/B)","value":"A"},{"text":"F=q<sup>2</sup>(v x B)","value":"B"},{"text":"F=q(v x B)","value":"C"},{"text":"F= vx B","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111199,"question":"When current passes through a solenoid coil, it behaves like a","choices":[{"text":"loop","value":"A"},{"text":"circle","value":"B"},{"text":"bar magnet","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111198,"question":"The strength of magnetic field around the current conductor is","choices":[{"text":"Smaller near the conductor","value":"A"},{"text":"Greater near the conductor","value":"B"},{"text":"Greater at the large distance from the conductor","value":"C"},{"text":"Constant near and away from the conductor","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111197,"question":"The magnetic field outside the solenoid due to current is","choices":[{"text":"strong","value":"A"},{"text":"zero","value":"B"},{"text":"weak","value":"C"},{"text":"uniform","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111196,"question":"Which one of the following relations is correct?","choices":[{"text":"1 Wb-m<sup>2</sup>= Nm<sup>-1</sup>A<sup>-1</sup>","value":"A"},{"text":"1 tesla = 104 gausses","value":"B"},{"text":"1 Wb-m<sup>2</sup>= 1 tesla","value":"C"},{"text":"All of the above","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111195,"question":"The magnetic field in the middle of a solenoid due to current is","choices":[{"text":"weak","value":"A"},{"text":"strong and uniform","value":"B"},{"text":"none-uniform","value":"C"},{"text":"zero","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111194,"question":"The SI unit of magnetic permeability is","choices":[{"text":"WB A<sup>-1</sup>m<sup>-1</sup>","value":"A"},{"text":"WB mA<sup>-1</sup>","value":"B"},{"text":"WB Am<sup>-1</sup>","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111193,"question":"Tesla is the unit of","choices":[{"text":"Magnetic induction or flux density","value":"A"},{"text":"Magnetic flux","value":"B"},{"text":"Self inductance","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1}]