A students connects an ammeter `A `and a voltmeter `V` to measure a resistancer as shown in figure. If the voltmeter reads `20 V` and the ammeter reads `4A`, then `R` is

Options

A. equal to 5 ohm
B. greater than 5 ohm
C. Less than 5 ohm
D. Greater or less than 5 ohm depending upon its material

Answer

B

Explanation

`i_(1)+i_(2)=4`

`i_(1) +i_(2)=4`
`i_(1)=4-i_(2)`
`therefore i_(1)lt 4A`
`i_(1)R =V`
` R= (20)/((lt 4))`
`R gt 5 Omega`