An unusual lightning strike has a vertical portion with a current of –400 A downwards. The Earth’s magnetic field at that location is parallel to the ground and has a magnitude of 30 μT. In units of N (Newtons), the force exerted by the Earth’s magnetic field on the 25 m-long current is Group of answer choices 300 A, East. 0.30 A, West. 0 0.012 A, East. 0.012 A, West.

Given that,

Current, I = 400 A (downwards)

The Earth’s magnetic field at that location is parallel to the ground and has a magnitude of 30 μT.

We need to find the force exerted by the Earth’s magnetic field on the 25 m-long current. We know that the magnetic force is given by :

Here,

The force is acting in a plane perpendicular to the current and the magnetic field i.e out of the plane.

the expression 15n + 2(3p) represents the amount isaiah spent buying gasoline and snacks, where n represents the price of each gallon of gasoline and p represents the cost of each snack that he bought. which statement is true about the amount isaiah spent?