Answer:
b. Paramagnetism
Explanation:
-Paramagnetism is a form of magnetism whereby some materials are weakly attracted by an externally applied magnetic field, and form internal, induced magnetic fields in the direction of the applied magnetic field.
-Given that this material produces an additional internal magnetic field parallel to the original field which disappears with the removal of the external field,it is said to Paramagnet.
Answer:

Explanation:
As we know that the rate of heat transfer due to temperature difference is given by the formula

here we know that

A = 4 m x 7 m
thickness = 30 cm
temperature difference is given as

now we have


<span><span>Work from Days:<span><span><span>If A can do a piece of work in n days, then A's 1 day's work =</span></span></span></span><span /></span>

<span><span>Days from Work:<span><span>If A's 1 day's work =</span></span></span></span>

<span><span><span><span>,<span>then A can finish the work in n days</span></span></span></span><span>Ratio:If A is thrice as good a workman as B, then:Ratio of work done by A and B = 3 : 1.Ratio of times taken by A and B to finish a work = 1 : 3.</span></span>
combustion of fossil fuels would be the correct answer when dealing with the alteration of the carbon cycle.