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A magnet of magnetic moment 50i^A-m2 is placed along the x-axis in a magnetic field B=(0.5i^+3.0j^)T. The torque acting on the magnet is

(a) 175 k^ N-m

(b) 150 k^ N-m

(c) 75 k^ N-m

(d) 2537 k^ N-m