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MHT CET 2020 Physics Solved Paper
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© examsnet.com
Question : 20
Total: 50
For which angle between two equal vectors
→
A
and
→
B
will the magnitude of the sum of two vectors be equal to the magnitude of each vector?
θ
=
60
∘
θ
=
120
∘
θ
=
0
∘
θ
=
90
∘
Validate
Solution:
|
→
A
+
→
B
|
=
√
A
2
+
B
2
+
2
A
B
cos
120
∘
(
θ
=
120
∘
)
=
√
A
2
+
B
2
+
not
2
A
B
(
−
1
not
2
)
(
cos
120
∘
=
−
1
2
)
=
√
A
2
+
B
2
−
A
(
A
)
=
√
B
2
=
B
(
∴
A
=
B
)
© examsnet.com
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