A point charge q is kept at the centre of a fixed semicircular thread

1.	A point charge q is kept at the centre of a fixed semicircular thread having a uniform charge per unit length lembda, the radius of the semicircular thread being R. The force required to keep the charge stationery is-
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A point charge q is kept at the centre of a fixed semicircular thread having a uniform charge per unit length lembda, the radius of the semicircular thread being R. The force required to keep the charge stationery is-

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A point charge q is kept at the centre of a fixed semicircular thread having a uniform charge per unit length lembda, the radius of the semicircular thread being R. The force required to keep the charge stationery is-

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