MCQOPTIONS
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				| 1. | 
                                    The Depth of penetration of EM wave in medium having conductivity σ at a frequency of 1 MHz is 25 cm. The depth of penetration at a frequency of 4 MHz will be | 
                            
| A. | 6.25 cm | 
| B. | 12.50 cm | 
| C. | 50 cm | 
| D. | 100 cm | 
| Answer» C. 50 cm | |