Answer:

Explanation:
Given data

To find
Magnitude of the net magnetic field B
Solution
The magnitude of the net magnetic field can be find as:

Answer:
= 30N - 10N = 20N
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Explanation:
I have put what a simple free body force diagram that you would need for this question below!
Just swap out the 5N and 3N with 30N and 10N :)
Answer:
Endothermic, because energy is absorbed (A)
Explanation:
The reaction that take place in the instant cold pack causes the surroundings around it, including the bag that contains it. When the bag loses heat to the cold pack, the cold pack absorbs the heat, thereby causing the environment (the bag) to be cold.
The strength of the gravitational force between two objects depends on two<span> factors, mass and distance. the </span>force<span> of </span>gravity<span> the masses exert on each other. If one of the masses is doubled, the </span>force<span> of </span>gravity between<span> the </span>objects<span> is doubled. thats what i got..</span>
Resistance decreases the flow of current in a circuit.
EXPLANATION:
The resistance of an electrical circuit is defined as the opposition to the flow of current in that particular circuit.
From Ohm's law, we know that current flowing through a wire I = 
Here,V is the potential across the two ends of a conductor or wire, and R is the resistance of that wire.
Hence, more is the resistance, the less will be the current flow in the current.