CBSE physics
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Define electric dipole moment. Write its S.I. unit.
Electric dipole moment is defined as the product of charge and the distance between the charges, and is directed from negative to positive charge.
The SI unit of electric dipole moment is coulomb metre (Cm).
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Where on the surface of Earth is the angle of dip 90°?
At poles, angle of dip is 90°
A hollow metal sphere of radius 5 cm is charged such that the potential on its surface is 10 V. What is the potential at the centre of the sphere?
Potential at centre of sphere is equal to 10 V.
How are radio waves produced?
Radio waves are produced by the accelerated motion of charges in conducting wires.
Two bar magnets are quickly moved towards a metallic loop connected across a capacitor ‘C’ as shown in the figure. Predict the polarity of the capacitor. 
Left face of the coil will act as North Pole and right face as South Pole so as to oppose the current induced in the coil. As seen from left, the direction of the current in the coil will be anti-clockwise. 
That is, plate of the capacitor A will be positive and plate B will be negative.
Upper plate is positive and lower plate is negative.
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Mock Test Series
Mock Test Series