Year: 2017
Topic: Magnetism and matter
Time :
1.
If \(θ_1\) and \(θ_2\) be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip \(\theta\) is given by
(1). \(tan^2θ = tan^2θ_1 + tan^2θ_2\)
(2). \(cot^2θ = cot^2θ_1 − cot^2θ_2\)
(3). \(tan^2θ = tan^2θ_1 − tan^2θ_2\)
(4). \(cot^2θ = cot^ 2θ_1 + cot^2θ_2\)