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1)A wire 11.80 m long carries a current of 1.30 A and makes an angle of 35.0 degrees with a uniform magnetic field of magnitude B=10.50 T. Calculate the magnitude of the magnetic force on the wire.
2)A proton in a magnetic field does not experience a force. Which of the following statements is correct with respect to this situation? I. The proton may have a zero velocity. II. The proton may be moving parallel to the direction of the magnetic field.
Answer
The two forces in each pair could have different physical origins (for instance, one of the forces could be due to gravity, and its pair force might be due to friction or electric charge).
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