If a charge particle moves in a straight line and there are no other forces on it, except possibly from a magnetic field, can you say with certainty that no magnetic field is present? Explain.

Question 1 : If a charge particle moves in a straight line and there are no other forces on it, except possibly from a magnetic field, can you say with certainty that no magnetic field is present? Explain.Question 2 : In a velocity sector, the uniform magnetic field of 1.5 T is produced by a large magnet. Two parallel plates with a separation of 1.5 cm produce the perpendicular electric field. What voltage should be applied across the plates so that: Question 3 A horizontal magnetic field of 1.0×10??T is at an angle of 30ø to the direction of the current in a straight wire 75 cm long. If the wire carries a current of 15 A, what is the magnitude of the force on the wire? Question 4 An electron travels at a speed of 2.0×10?? m/s through a uniform magnetic field of strength 1.2×10??T. What is the magnitude of the magnetic force on the electron if its velocity and the magnetic field: Question 5 A square loop of wire with sides of length 40 cm is in a uniform magnetic field perpendicular to its area. If the field?s strength is 100 mT and it decays to zero in 0.010 seconds: Question 6 The armature of an ac generator has 100 turns. Each turn is a rectangular loop measuring 8.0 cm by 12 cm. The generator has a sinusoidal voltage output with an amplitude of 24 V. If the magnetic field of the generator is 250 mT:Question 7 An ac generator supplies 20 A at 440 V to a 10,000 V power line. If the step up transformer has 150 turns in its primary coil, how many turns are in the secondary coil?