# Physics

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The conducting rod ab shown below makes frictionless contact with metal rails ca and db. The apparatus is in a uniform magnetic field of 0.855 T, perpendicular to the plane of the figure. The length L of the rod is 25 cm. (a) Find the magnitude of the emf induced in the rod when it is moving towards the right with a speed of 6.50 m/s. (b) In what direction does the current flow in the rod (clockwise or counter-clockwise)? Write several sentences that clearly explain your reasoning. (c) If the resistance of the circuit abdc is a constant 3.5 Ω, find the magnitude and direction of the force required to keep the rod moving to the right with a constant speed of 6.5 m/s.

• Physics -

The conducting rod ab shown below makes frictionless contact with metal rails ca and db. The apparatus is in a uniform magnetic field of 0.855 T, perpendicular to the plane of the figure. The length L of the rod is 25 cm. (a) Find the magnitude of the emf induced in the rod when it is moving towards the right with a speed of 6.50 m/s. (b) In what direction does the current flow in the rod (clockwise or counter-clockwise)? Write several sentences that clearly explain your reasoning. (c) If the resistance of the circuit abdc is a constant 3.5 Ù, find the magnitude and direction of the force required to keep the rod moving to the right with a constant speed of 6.5 m/s.

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