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43. Two cells, each with electromotive force (emf) E, but different internal resistances 11 and
r2, are connected in series to a resistor R. The reading on the voltmeter is O
What is the resistance of R?
a-0
b-r1-r2
c-r1+r2
d(r1×r2/r1+r2)

The scalar triple product computes the magnitude m of the moment of a force vector f about a specified line. it is m = (r × f) · n, where r is the position vector from the line to the point of application of the force and n is a unit vector in the direction of the line. use matlab to compute the magnitude m for the case where f = [12, −5, 4] n, r = [−3, 5, 2] m, and n = [6, 5, −7].