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# klas3 - Klastoets 3 Classtest 3 1 Die ladings en koordinate...

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Klastoets 3 / Classtest 3 1. Die ladings en koordinate van twee gelaaide deeltjies wat vas gehou word in die xy vlak is: q 1 =3.0 μ C, x 1 =3.5 cm, y 1 =0.5 cm en q 2 =-4 μ C, x 2 =-2.0 cm, y 2 =1.5 cm. Bepaal die grootte en rigting van die elektrostatiese krag op q 2 . The charges and coordinates of two charged particles held fixed in the xy plane are: q 1 =3.0 μ C, x 1 =3.5 cm, y 1 =0.5 cm and q 2 =-4 μ C, x 2 =-2.0 cm, y 2 =1.5 cm. Find the magnitude and direction of the electrostatic force on q 2 . (5) [ ] ° - = - = - - = = × - + - - × × × = - + - = = - - - - 10 5 . 5 1 tan tan N 5 . 34 10 ) 5 . 0 5 . 1 ( ) 5 . 3 2 ( ) 10 4 )( 10 3 )( 10 99 . 8 ( ) ( ) ( 4 1 4 1 1 2 1 2 1 4 2 2 6 6 9 2 1 2 2 1 2 2 1 0 2 12 2 1 0 21 x x y y y y x x q q r q q F θ πε πε Waar sal ‘n derde lading q 3 =4.0 μ C geplaas moet sodat die netto elektrostatiese krag op q 2 nul is? Where could you locate a third charge q 3 =4.0 μ C such that the net electrostatic force on q 2 is zero? (4) cm 5 . 6 5 . 34 ) 10 99 . 8 )( 10 4 )( 10 4 ( 4 4 1 en as lyn dieselfde op 0 Vir 9 6 6 21 0 3 2 21 2 3 2 0 23 2 1 3 = × × × = = = = = - - F q q r F

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