Explanation : Negative sign shows the opposite direction of the given vector, also the magnitude of the vector is multiplied by 2. So the required
vector -2A = 20 cm south.
Explanation : We know that, F = qvBsin θ; where, q = Charge v = Velocity of charge B = Magnetic field Q = Angle between magnetic field and motion of charge = 0 So, F = qvBsin0° = 0.
Explanation : Marsh gas is commonly known as biogas which forms in wetland whose principle components arc methane, phospin and di-phosphorus pentahydrade.