Problem Three. A small block of mass m and positive charge Q is placed on an insulated, inclined plane of angle as in the figure below. An electric field is applied toward the right. There is a coefficient of static friction us between the block and the ramp. 8. Find an expression for the magnitude of the minimum electric field that enables the block to remain at rest. (A) E= mg(u, sin 0+ cos 0) Q(sin 0-μ, cos 0) mg (sin 0μ cos 0) Q(cos0+ μ, sin 0) (C) E= (B) E= (D) E= Q(sin 0-μ, cos) mg (u, sin 0-cos) mg(sin 0-u, cos 0) Q(u, sin 0-cos) (E) E= m Q(u, sin 0 + cos 0) mg (sin 0-μ, cos 0) 3

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.