I have exam plz can anyone help me plz in physics

When applying kirchhoff's rules, one of the essential steps is to mark each resistor with plus and minus signs to label how the electric potential changes from one end of the resistor to the other. the circuit in the drawing contains four resistors, each marked with the associated plus and minus signs. however, one resistor is marked incorrectly. which one is it?

According to newton’s first law of motion, which force is expected to cause a body to accelerate?

Use the right-hand rule for magnetic force to determine the charge on the moving particle. this is a charge.