A wire in a uniform magnetic field of 0.350 T carries a current of 3.50 A. If the magnitude of the magnetic force per unit length on the wire is 0.278 N/m, what is the angle between the magnetic field and the current?
a. 13.1°
b. 19.9°
c. 4.56°
d. 52.6°
a
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A pendulum consists of a mass m suspended from a string of length L. When the pendulum is swinging, how much greater is the mass's potential energy when the string is displaced from the vertical by the angle ? than when the mass is at the lowest position?
a. mgLsin? b. mgLcos? c. mgL(1 – sin?) d. mgL(1 – cos?)
A particle of charge +2q is placed at the origin and particle of charge -q is placed on the x-axis at x = 2a. Where on the x-axis can a third positive charge be placed so that the net electric force on it is zero?
A) 3.4a B) 6.8a C) 8.6a D) 9.3a E) 1.0a
A particle (m = 2.0 mg, q = -5.0 mC) has a speed of 30 m/s at point A and moves (with only electric forces acting on it) to point B where its speed is 80 m/s. Determine the electric potential difference VA - VB
a. -2.2 kV b. +1.1 kV c. -1.1 kV d. +2.2 kV e. +1.3 kV
When material expanding away from a star in a binary system leaves a star’s Roche lobe,
a. the material will start to fall back toward the star.
b. all of the material will accrete on to the companion.
c. the material is no longer gravitationally bound to that star.
d. the material will increase in temperature an eventually undergo thermonuclear fusion.
e. c and d.