A pulling force making an angle $\mathrm{\theta }$ with the horizontal is applied on a block of weight W placed on a horizontal table. If the angle of friction is $\mathrm{\varphi }$ , the magnitude of the force required to move the body is equal to

• A

  $\frac{\mathrm{WCos}\mathrm{\varphi }}{\mathrm{Cos}(\mathrm{\theta }-\mathrm{\varphi })}$

• B

  $\frac{\mathrm{Wsin}\mathrm{\varphi }}{\mathrm{Cos}(\mathrm{\theta }-\mathrm{\varphi })}$

• C

  $\frac{\mathrm{WTan}\mathrm{\varphi }}{\mathrm{Sin}(\mathrm{\theta }-\mathrm{\varphi })}$

• D

  $\frac{\mathrm{WSin}\mathrm{\varphi }}{\mathrm{Tan}(\mathrm{\theta }-\mathrm{\varphi })}$