4:- Using right hand thumb rule and since the charge ion the electron is negative the direction of the force ion the electron comes out to be towards Right.
5:- F = qvBsinθ
F = 3 * 10-6 * 7.8 * 104 * 1.5 * sin 300
F = 17.55 * 10-2 = 0.1755
Hence rounding off to two digits the ans is A. 0.18N
6:- Force between to parallel wires is given by
F = μ0I1I2L/2πr
F = 2*10-7 9 * 9 * 1.5 /0.01
F = 2.43 * 10 -4 N
Ans D. 2.4 * 10 -4 N
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