draw the diagram of two equal vectors
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Answer:
Answer
Correct option is
B
120
o
Applying the formula:
R
2
=P
2
+Q
2
+2PQcosα
P
2
=P
2
+P
2
+2PPcosα
=2P
2
+2P
2
cosα
=2P
2
(1+cosα)
1+cosα=
2
1
⇒2cos
2
2
α
=
2
1
⇒cos
2
2
α
=
4
1
⇒cos
2
α
=
2
1
=cos60
o
⇒
2
α
=60
o
⇒α=120
o
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