Roboguru

Perhatikan gambar berikut ini. Jika titik P ter...

Perhatikan gambar berikut ini.

Jika titik P terletak tepat di tengah AB maka kuat medan yang dialami titik P sebesar.. (k=9x109 Nm2/C2; 1 µC=10-6 C).

  1. 9,0 x 106 N/C

  2. 7,2 x 106 N/C

  3. 3,6 x 106 N/C

  4. 2,7 x 106 N/C

  5. 1,8 x 106 N/C

Jawaban:

Diketahui :

begin mathsize 14px style italic Q subscript 1 equals 2 μC equals 2 cross times 10 to the power of negative sign 6 end exponent C italic Q subscript 2 equals 1 μC equals 1 cross times 10 to the power of negative sign 6 end exponent C italic r subscript 1 equals 5 space cm equals 5 cross times 10 to the power of negative sign 2 end exponent space m italic r subscript 2 equals 5 space cm equals 5 cross times 10 to the power of negative sign 2 end exponent space m italic k equals 9 cross times 10 to the power of 9 space begin inline style bevelled Nm squared over C squared end style end style 

 

Pembahasan :

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell italic E subscript P end cell equals cell italic E subscript 1 minus sign italic E subscript 2 end cell row blank equals cell italic k italic Q subscript 1 over italic r subscript 1 squared minus sign italic k italic Q subscript 2 over italic r subscript 2 squared end cell row blank equals cell italic k open parentheses italic Q subscript 1 over italic r subscript 1 squared minus sign italic Q subscript 2 over italic r subscript 2 squared close parentheses end cell row blank equals cell 9 cross times 10 to the power of 9 open parentheses fraction numerator 2 cross times 10 to the power of negative sign 6 end exponent over denominator open parentheses 5 cross times 10 to the power of negative sign 2 end exponent close parentheses squared end fraction minus sign fraction numerator 1 cross times 10 to the power of negative sign 6 end exponent over denominator open parentheses 5 cross times 10 to the power of negative sign 2 end exponent close parentheses squared end fraction close parentheses end cell row blank equals cell 9 cross times 10 to the power of 9 open parentheses 8 cross times 10 to the power of negative sign 4 end exponent minus sign 4 cross times 10 to the power of negative sign 4 end exponent close parentheses end cell row blank equals cell 3 comma 6 cross times 10 to the power of 6 space begin inline style bevelled N over C end style end cell row blank blank blank end table end style

Jadi, jawaban yang tepat adalah C

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