Five current carrying conductor meet at a point P. What is the magnitude and direction of the current in the fifth conductor ?

Options

A. 1A from Q to P
B. 1 A from P to Q
C. 3 A from P to Q
D. 2 A from Q to P

Answer

B

Explanation

According to Kirchoff's first law, `sum i=0` at point P
`therefore 5+4-3-5+I=0`
`therefore I+1=0 or I= - 1A`
Negative sign shows that the current of 1 A is flowing away from the point P i.e. from P to Q.