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Why do you have to differentiate?

13. A loop of wire is in the xy-plane, in a uniform but time-dependent magnetic field B (3t-0.2t3) k] T. At what time t does the induced current in the loop switch direction? a100s b) 5.00s c)3.33 s d)2.50s e) 1
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anthc field入trength increas u with ti ne thu n it decrea-ck To find out ㈩ne int9nt whe re d B dt dt wken mgn ee field (ndu(ed

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