It’s the first one 28282929/9292
Answer:
Magnetic field lines never intersect each other.
They originates(from north pole) and terminates (to south pole) perpendicularly from/to the surface of magnet. Also magnetic field lines continues through the magnet.
Magnetic field is denser at the pole and becomes less dense as we move away from the poles.
Explanation:
<h2>
Option B is the correct answer.</h2>
Explanation:
We need to find number of protons, electrons and neutrons in ⁶²Ni
Mass number is 62.
That is
Number of proton + Number of neutron = 62
We know that number of proton = 28 for nickel
So
28 + Number of neutron = 62
Number of neutron = 62 - 28 = 34
We also know
Number of protons = Number of electrons
Number of electrons = 28
Option B is the correct answer.
The efficiency of the device is 30 %
Explanation:
The efficiency of a heat engine is given by:
where
W is the work done by the engine
is the heat in input to the engine
For the device in this problem, we have:
W = 120 J is the work done
is the heat in input
Substituting, we find the efficiency:
which corresponds to an efficiency of 30%.
Learn more about work:
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