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A proton,with mass 1.67 × 10-27 kg and charge +1.6 × 10-19 C,is sent with velocity 7.1 × 104 m/s in the +x direction into a region where there is a uniform electric field of magnitude 730 V/m in the +y direction.What are the magnitude and direction of the uniform magnetic field in the region,if the proton is to pass through undeflected? Assume that the magnetic field has no x-component and neglect gravitational effects.
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A substance used in a tuberculin skin test (TST) to detect tuberculosis infection.
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