Question

Shashank appeared for a competitive exam comprising 50 questions. In the

exam, 5 marks are awarded for each correct answer and some marks are

deducted for each wrong answer. Also, 1 mark is deducted for each

unattempted question. Shashank attempted 42 questions and got 14 of them

incorrect. His overall score in the exam was 90. How many marks are

deducted for each incorrect answer in the exam?​

Answer 1

Answer:

Two balls of charges q1 and q2, initially have exactly same velocity. Both the balls are subjected to same uniform electric field for same time. As a result , the velocity of the first ball is reduced to half of its initial value and its direction changes by 60° .The direction of the velocity of second ball is found to change by 90.

The electric field and initial velocity of the charged particle are inclined at angle

1)60. (2)30

3) 90. (4)150