5. Viewers of Star Trek hear of an antimatter drive on the Starship Enterprise. One possibility for such a futuristic energy source is to store antimatter charged particles in a vacuum chamber, circulating in a magnetic field, and then extract them as needed. Antimatter annihilates with normal matter, producing pure energy. What strength (in T) magnetic field is needed to hold antiprotons, moving at 5.30 10⁷ m/s in a circular path 1.50 m in radius? Antiprotons have the same mass as protons but the opposite (negative) charge. (Enter the magnitude.) Ans=--------T

8.A wire carrying a 29.0 A current passes between the poles of a strong magnet such that the wire is perpendicular to the magnet's field, and there is a 2.35 N force on the 2.00 cm of wire in the field. What is the average field strength (in T) between the poles of the magnet?

9. a. By how many percent is the torque of a motor decreased if its permanent magnets lose 2.5% of their strength? %

(b)How many percent would the current need to be increased to return the torque to original values? %

10. a. What is the maximum torque (in Nm) on a 175 turn square loop of wire 18.0 cm on a side that carries a 46.0 A current in a 1.60 T field? Nm

(b)What is the torque (in Nm) when is 10.9? Nm

11. Calculate the magnetic field strength (in T) needed on a 205 turn square loop 20.0 cm on a side to create a maximum torque of 320 Nm, if the loop is carrying 25.0 A. T

12The figure below shows a long straight wire just touching a circular loop carrying a current I₁ = 2.00 A in the clockwise direction. Both lie in the same plane. What current must the long straight wire carry in order have zero net magnetic field strength at the center of the loop?

14. You have designed and constructed a solenoid to produce a magnetic field equal in magnitude to that of the Earth(5.0*10^-5T).If your solenoid has350turnsand is32cmlong, determine the current you must use in order to obtain a magnetic field of the desired magnitude.

15.The wire carrying 375 A to the motor of a commuter train feels an attractive force of 5.00 10³ N/m due to a parallel wire carrying 5.00 A to a headlight.(a)How far apart (in m) are the wires? How far apart (in m) are the wires?