00:01
In this question we are given a solenoid of radius r is equal to 4 .2 centimeter.
00:07
So to convert this to meter, we need to multiply it by 10 .4 minus 2.
00:12
Hence we get 4 .2 into 10 power minus 2 meter.
00:18
And then we are given the number of turns in the solenoid n equal to 100.
00:24
And then the magnetic field is remaining at 1 .5.
00:30
12 .5 tesla at the initial t and then it increases to the value of 15 .5 tesla.
00:39
Hence we need to find the change in magnetic field db will be equal to 15 .5 minus 12 .5.
00:49
Hence we get db is equal to 3 tesla and then change in time dt is given as 1 .5 seconds.
00:58
Using all these values, we need to find the average value of emf.
01:04
Hence, average emf epsilon will be equal to minus n d5 by dt...