Question

Q.1 The magnetic flux through a coil is varying according to the relation
Q =( 4t? + 5t + 8t? + 5) Wb
Calculate the induced current through the coil at t = 2s if resistance of coil is 3.1 ohm.
(a) 21.45 A
(b) 42.45 A
(c) 62.52 A
(d) None of these​

Answer 1

Answer:

none of these is correct answer maybe

of the answer is correct mark 1 brsinst

Answer 2

ϕ=(5t

3

+4t

2

+2t−5) Weber

time t=2 sec

Resistance =5Ω

induced emf E=

dt

dϕ

dt

dϕ

=15t

2

+8t+2

at t=2 sec,

dt

dϕ

=15×4+8×2+2

=78 V

Also E=IR

E=78 V,R=5Ω

I=

R

k

=

5

78

=15.6 A

please mark me as brainliest