A particle of mass m and charge q is fastened to one end of a string of length l. The other end of the string is fixed to the point 0. The whole system lies on a frictionless horizontal plane. initially, the mass is at rest at A. A uniform electric field in the direction shown is then switched on. Then (a) the speed of the particle when it reaches B is under root 2qEl/m (b) the speed of the particle when it reaches B is under root qEl/m (c) the tension in the string when the panicle reaches at B is qE (d) the tension in the string when the particle reaches at B is zero

A particle of mass m and charge q is fastened to one end of a string o

1.	A particle of mass m and charge q is fastened to one end of a string of length l. The other end of the string is fixed to the point 0. The whole system lies on a frictionless horizontal plane. initially, the mass is at rest at A. A uniform electric field in the direction shown is then switched on. Then (a) the speed of the particle when it reaches B is under root 2qEl/m (b) the speed of the particle when it reaches B is under root qEl/m (c) the tension in the string when the panicle reaches at B is qE (d) the tension in the string when the particle reaches at B is zero
Answer» A particle of mass m and charge q is fastened to one end of a string of length l. The other end of the string is fixed to the point 0. The whole system lies on a frictionless horizontal plane. initially, the mass is at rest at A. A uniform electric field in the direction shown is then switched on. Then (a) the speed of the particle when it reaches B is under root 2qEl/m (b) the speed of the particle when it reaches B is under root qEl/m (c) the tension in the string when the panicle reaches at B is qE (d) the tension in the string when the particle reaches at B is zero