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Question
A charged particle is whirled in a horizontal circle on a frictionless table by attaching it to a string fixed at one point. If a magnetic field is switched on in the vertical direction, the tension in the string
A charged particle is whirled in a horizontal circle on a frictionless table by attaching it to a string fixed at one point. If a magnetic field is switched on in the vertical direction, the tension in the string
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Solution
The correct option is D may increase or decrease
Lets assume direction of magnetic field is vertically upwards.
therefore, if charge is moving in clockwise direction as seen from upwards then magnetic force will act radially inwards and provide centripetal force therefore, tension in the string will reduce.
Now if charge is moving anti clockwise then the magnetic force acting on it will be radially outwards and tension in the string will increase to maintain the circular motion and keep the velocity of charge constant.
Lets assume direction of magnetic field is vertically upwards.
therefore, if charge is moving in clockwise direction as seen from upwards then magnetic force will act radially inwards and provide centripetal force therefore, tension in the string will reduce.
Now if charge is moving anti clockwise then the magnetic force acting on it will be radially outwards and tension in the string will increase to maintain the circular motion and keep the velocity of charge constant.
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