Question

please answer........

Answer 1

The option (a) is correct

(b) is incorrect because it is shown dot- product. and we use cos© in dot- product. and cos 90° is zero. so it should be 0.

(c) is incorrect because cos 0° is 1. thus it should be 1.

(d) is incorrect because it is uncertain. j + j can be anything.

Finally, ( a) is correct because j x k is cross product and we use sin© in it. and sin 90 = 1. and since it is clock wise it is equal to i.

Answer 2

The option (a) is correct

(b) is incorrect because it is shown dot- product. and we use cos© in dot- product. and cos 90° is zero. so it should be 0.

(c) is incorrect because cos 0° is 1. thus it should be 1.

(d) is incorrect because it is uncertain. j + j can be anything.

Finally, ( a) is correct because j x k is cross product and we use sin© in it. and sin 90 = 1. and since it is clock wise it is equal to i.