00:00A vector, B vector, C vector
00:033 unit vector
00:04A vector dot B vector
00:07A vector dot C vector
00:092 are 0
00:10So, this is how we know
00:12A vector, B vector and C vector
00:142 are perpendicular
00:16B vector and C vector
00:18The base angle is pi by 6
00:20So, this is pi
00:253.14
00:293.14
00:313.14
00:33Radian
00:33So, this is pi by 6
00:36Radian
00:38So, this is the degree
00:393.14
00:42Radian is equal to 180
00:43So, this is the degree
00:47180
00:48So, this is 180 by 6
00:50So, this is the angle
00:52B vector and C vector
00:53C vector
00:5430 degree angle
00:55So, this is A vector
00:56value
00:57To be B vector
00:59C vector
00:59A vector
01:01direction
01:01or opposite direction
01:04then
01:05in option
01:06B vector
01:07C vector
01:08or
01:09B vector
01:12C vector
01:13A vector
01:14Do
01:15option
01:15bin
01:15cross
01:19C vector
01:20direction
01:21direction now we have to know how to multiply a vector cross c vector
01:28so b vector cross c vector what is magnitude of b into magnitude of c into sin theta
01:37formula so then magnitude of b and magnitude of c 1 1
01:441 into sin 30 degree 1 by 2 1 by 2 multiply a vector
01:511 because this is unit vector
01:54x into 1 by 2 is equal to 1
02:01x is equal to 2
02:03so if we have 2 b vector cross c vector
02:07then it will be equal to a vector
02:09so our option number is c
02:112 b vector cross c vector
02:13b vector cross c vector
02:15x is equal to 1
02:15x is equal to 1
02:15x is equal to 1
02:15x is equal to 2
