Que 35 :
Statement -A: Canal rays move from cathode to anode.
Statement -R: Canal rays are made up of positive charge particles.
if Statement A is true, Statement Ris true; Statement Ris correct explanation for
statement A
B
if Statement A is true, statement Ris true; Statement Ris not correct explanation for
statement A
if Statement A is true, Statement Ris false
D
if Statement A is false, statement R is true
Answers
Explanation:
we have to find the magnitude of displacement of the particle which is moving from A to B.
solution : this question can be solved by many methods. but the most easiest method for this type of question is vector method.
we assume, horizontal line as x - axis and vertical line as y - axis
so, horizontal line denotes i (unit vector) and vertical line denotes j with sign.
particle starts to move from A and moves 70 m along positive direction of x - axis.
so, in vector form, s₁ = 70i
then moves 65 m along negative direction of y - axis
so, s₂ = -65 j
similarly, s₃ = -32i , s₄ = -13j , s₅ = -95i , s₆ = +44j
s_7s
7
= 30i , s_8s
8
= 60j , s_9s
9
= 27i , s₁₀ = -9j , s₁₁ = 15i , s₁₂ = 3j
now displacement of particle from A to B = s_1+s_2+s_3+s_4+s_5+s_6+s_7+s_8+s_9+s_{10}+s_{11}+s_{12}s
1
+s
2
+s
3
+s
4
+s
5
+s
6
+s
7
+s
8
+s
9
+s
10
+s
11
+s
12
= 70i -65j -32i - 13j - 95i + 44j + 30i + 60j + 27i - 9j + 15i + 3j
= (70 - 32 - 95 + 30 + 27 + 15)i + (-65 - 13 + 44 + 60 - 9 + 3)j
= 15i + 20j
Therefore the magnitude of displacement of particle is √(15² + 20²) = √(225 + 400) = 25 m
Answer:
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