Nuclei — Physics STD 12 Science — Question

A charge of 5C  experiences a force of 5000 N when it is kept in a uniform electric field. What is the potential difference between two points separated by a distance of 1 cm (a) 10 V(b) 250 V (c) 1000 V (d) 2500 V

A uniform electric field pointing in positive X-direction exists in a region. Let A be the origin, B be the point on the X-axis at x = +1 cm and C be the point on the Y-axis at y 1 cm. Then the potential at points A, B and C satisfy

Assertion : According to classical theory, the proposed path of an electron in Rutherford atom model will be parabolic.
Reason     : According to electromagnetic theory an accelerated particle continuously emits radiation.(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If assertion is false but reason is true.

When the current change from + 2A to – 2A in 0.05 second, an e.m.f. of 8 V is induced in a coil. The coefficient of self-induction of the coil is(a) 0.1 H(b) 0.2 H(c) 0.4 H  (d) 0.8 H

In a region of constant potential:

When the current through the electromagnet of a relay reaches a particular value.

For non-conductors, the energy gap is(a) 6 eV  (b) 1.1 eV(c) 0.8 eV (d) 0.3 eV