The magnetic flux `phi` (in weber ) in a closed circuit of resistance 10`Omega` varies with time t (in secnod) according to equation `phi=6t^(2)-5t+1`

Question

The magnetic flux `phi` (in weber ) in a closed circuit of resistance 10`Omega` varies with time t (in secnod) according to equation `phi=6t^(2)-5t+1`

The magnetic flux `phi` (in weber ) in a closed circuit of resistance 10`Omega` varies with time t (in secnod) according to equation `phi=6t^(2)-5t+1`. The magnitude of induced current at `t=0.25` s is
A. `0.2A`
B. 0.6A
C. 1.2A
D. 0.8A

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - A
We know that `e = - (dphi)/(dt)`
` = -(d)/(dt) (6t^(2) - 5t+1)`
` e=- 12 t + 5`
` e= - 12 xx 0.25 + 5 = 2V`
`therefore " " I =(e )/(R) = (2)/(10) = 0.2A`
Reading of the ammeter.

4 views Answered 2023-02-05 15:29