11. A particle of mass m and charge q is in a circular orbit of radius R normal to an external magnetic field B. The magnetic field, at the center of its orbit, created by the charge is ______. (A) (B) (C)(D) (E)

2. The first stage of a Saturn V space vehicle consumes fuel and oxidizer at the rate of 1.50 × 10⁴ kg/s, with an exhaust speed of 2.60 × 10³ m/s. What is the acceleration of the vehicle just as it vertically lifts off the launch pad on the Earth if the vehicle's initial mass is 3.00 × 10⁶ kg? (A) 7.40 m/s² (B) 5.37 m/s² (C) 3.20 m/s² (D) 1.48 m/s² (E) None of the above is correct.

11. A particle of mass m and charge q is in a circular orbit of radius R normal to an external magnetic field B. The magnetic field, at the center of its orbit, created by the charge is ______.
(A)
(B)
(C)
(D)
(E)

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