A coil having n turns and resistance \[R\Omega \]. Is connected with a galvanometer of resistance\[4R\,\Omega \]. This combination is moved in time t second from a magnetic flux \[{{\phi }_{1}}\]weber to\[{{\phi }_{2}}\] weber. The induced current in the circuit is

• A. \[-\frac{{{\phi }_{2}}-{{\phi }_{1}}}{5\,Rnt}\]   
• B. \[-\frac{n({{\phi }_{2}}-{{\phi }_{1}})}{5\,Rt}\]
• C. \[-\frac{({{\phi }_{2}}-{{\phi }_{1}})}{\,Rnt}\]   
• D. \[-\frac{n({{\phi }_{2}}-{{\phi }_{1}})}{\,Rt}\]