We can differentiate ‘contact force’ and ‘field force’ by
A) magnitude
B) direction
C) distance of contact
D) above all
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Limiting force of static friction does NOT depend on (A) actual area of contact.
(C) interlocking between surfaces in contact.
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One end of copper rod is in contact with water at 100 °C and the other end in contact with ice at 0 °C. The length of the rod is 100 cm.
Correct option is: (A) 35 °C
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The force exerted by an electric field on a charge of +10 µC at a point is 16 × 10^-4 N. What is the intensity of the electric field at the point?
Given: q = 10 µC = 10 × 10-6 C, F = 16 × 10-4 N To find: Electric field intensity (E) Formula: E = \(\frac{F}{q}\) Calculation: From formula, E = \(\frac{16\times10^{-4}}{10\times10^{-6}}\) = 160 N/C
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If a charge is moved against the Coulomb force of an electric field, (A) work is done by the electric field
(B) energy is used from some outside source
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Gravitational force between two bodies exists A) when they are in contact only
C) any of the above two cases
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Pressure = ………… A) Force B) Force x area C) Area / force D) Force / area
D) Force / area
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Assertion (A): Magnetic force is a field force. Reason (R): A magnet can attract or repel another magnet with zero magnitude.
C) A is true, but R is false
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Which one of these is not a contact force?
D) Magnetic force
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Which one of these is not a contact force?
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To prove that the frictional force is independent of the area of contact, the required materials and apparatus are
B) spring balance, brick, thread
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