railway RRB JE (CBT I + CBT II) Mock Test 2024 Electronic Devices Carrier Transport

यदि σ = 4.0/m और E = 5.0 V/m है, तो चालन धारा घनत्व कितना है?

1
10.0 A/m2
2
5.0 A/m2
3
1.25 A/m2
4
20.0 A/m2
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