An aeroplane, with its wings spread 10m, is flying at a speed of 180 km/h in a horizontal direction. The total intensity of earth’s field at that part is 2.5 × 10^-4Wb/m² and the angle of dip is 60°. The emf induced between the tips of the plane wings will be

<p>B_v = B sin 60°</p><p><math><mrow><msub><mrow><mi>B</mi></mrow><mrow><mi>v</mi></mrow></msub><mo>=</mo><mn>2</mn><mo>.</mo><mn>5</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>4</mn></mrow></msup><mo>×</mo><mfrac><mrow><mroot><mrow><mn>3</mn></mrow><mrow></mrow></mroot></mrow><mrow><mn>2</mn></mrow></mfrac></mrow></math></p><p><math><mrow><mi>E</mi><mi>m</mi><mi>f</mi><mo>=</mo><msub><mrow><mi>B</mi></mrow><mrow><mi>v</mi></mrow></msub><mo>×</mo><mi>v</mi><mo>×</mo><mi mathvariant="script">l</mi><mo>=</mo><mn>2</mn><mo>.</mo><mn>5</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>4</mn></mrow></msup><mo>×</mo><mfrac><mrow><mroot><mrow><mn>3</mn></mrow><mrow></mrow></mroot></mrow><mrow><mn>2</mn></mrow></mfrac><mo>×</mo><mn>1</mn><mn>8</mn><mn>0</mn><mo>×</mo><mfrac><mrow><mn>5</mn></mrow><mrow><mn>1</mn><mn>8</mn></mrow></mfrac><mo>×</mo><mn>1</mn><mo>=</mo><mn>1</mn><mn>0</mn><mn>8</mn><mo>.</mo><mn>2</mn><mn>5</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>3</mn></mrow></msup><mi>v</mi><mi>o</mi><mi>l</mi><mi>t</mi><mi>s</mi></mrow></math></p>

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