Question

VERSIUN -B- nen a positive charge moves opposite to the direction of the electric field, A) the field does positive work on it and the potential energy increases. B) the field does positive work on it and the potential energy decreases. C) the field does negative work on it and the potential energy increases. Motion D) the field does negative work on it and the potential energy decreases. 2) A strong lightning bort transfers about 40 C to Earth. How many electrons are transferred? 171019 B) 2.5x1018C) 25x1019 D) 85x1019 3) Two lab partners are doing a static electricity investigation. They begin with a neutral pop can. After conducting the procedure, they observe that the pop can has become charged positively. Which statement accurately explains how this happened? A) Electrons were added to the object. B) Protons were added to the object. C) Electrons were removed from the object. D) Protons were removed from the object. 4) Two-point charges, separated by 0.05 m, have charge values of +3.0 and -1.0 respectively. What is the value of the mutual force between them? A) 67.4N B) 43.2 N C) 269 N D )10.8 N C, 5) A positive charge of 3.0 x 10*coulomb is placed in an upward directed uniform electric field of 2.0 x 10' N/C. When the charge is moved 0.5 meter upward, the work done by the electric force on the charge is A) 3x 104] B) 12 x 104) C) 2 x 10^) D) 8 x 10*) E) 12 x 10' 6) What is the strength (in V/m) of the electric field between two parallel conducting plates separated by 3 cm and having a potential difference (voltage) between them of 9.00 x 10' V? A) 8.11x105 V/m B) 1x10 V/m C) 81.1x105 V/m D) 3x10 V/m 7) A capacitor stores 6 microcoulombs of charge with a potential difference of 3 volts across the plates. What is the capacitance? A) 9x10F B) 2x106F C) 4x10F D) 6x1067

Answer 1

The electric field potential and force

. The electric force E = qe Here force & displacement are - in isoo direction so wook is - negative And potential energy increase - Option ③ @= ne no Q = = 25 Xlo. foc 1.681019 n =as iols ☺ positive charse s from object charge ③ electrons re more to become positive F = kq, 92 02

f— 9Xio Syx 10 6x xj o 6 (o • o ) 2- - To g w = - 40 – 9ду (дv=-єдт — w —— ЧЕдX w —— 3Xio е х 2 хоч xo.s и — 3х10 9 т ) С= — 4V Да эх 4 Зх,ə 2 у m е - зxio 6 m @ = 6 xio от а с 3 c=2x10-6F ②