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A particle having a charge of \( 20 \mu \mathrm{C} \) and mass \( 20 \mu \mathrm{g} \) moves along a circle of radius \( 5 \mathrm{~cm} \) under the action of a magnetic field \( B=0.1 \) tesla. When the particle is at \( P \), uniform transverse electric field is switched on and it is found that the particle continues along the tangent with a uniform velocity. Find the electric field
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